Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcfe71d5edb047ca…

MALICIOUS

PDF

91.4 KB Created: 2021-08-19 08:33:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d4de96e8015c78e0ba1c5f4097a8968a SHA-1: 670922d5a5f72c5fa39498a8c13a40fad941b08a SHA-256: dcfe71d5edb047ca829b7c865a2ef936c950979dadadf791f3df8a2ce0941d3a
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/ba7e21716e8d69d8fa8f86db36ff36b3/69577185362.pdf In PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/4mcfdrvpcvdoljjh2d7jmi4rj0/55137604138.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/86333957354.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1432dae24---19293791371.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/0a06277871683897f77791cddc38d065/52599295898.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f95ab87919d---89038103206.pdfIn PDF document text
    • http://s-box.biz/upload/datoteke/vivosivawedaxifiranuzum.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/doretogadamusosabonun.pdfIn PDF document text
    • http://yulintimber.cn/d/files/80106194194.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/aafb478262d83fd1a10c5d51682ca05b/wikavijasovupuxemimed.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc39d3a2cb5---newebojameletotafu.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/ce7e31a6b028ff735e22d5a7cc761b8f/mogovoxomixakifelur.pdfIn PDF document text
    • http://cwesp.biz/upload/file/67940934841.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/10438113991.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ece8d0e79---87281940952.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4e0ac24ef---68686649866.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/78150722111.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf528d1a0e2---17713825119.pdfIn PDF document text
    • http://albertaracecar.ca/clients/49797/File/lusukukojavik.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/33775086737.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/fonewofuverezulogikakako.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/ginuxepexutarivuzakeb.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a737cedaea5---92258791589.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/9c8ccb09d1b2eb17e3941bd5da99f8d1/zemumuv.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/13936239192.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/cmvlqps708b84tpaek9gicjdjj/donikaj.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/ecc42b7cd30aadab3363aeba9a294f90/8768779896.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=forza+horizon+2+pc+registration+codePDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/5f3e0c012865c2118c9e12efaa75d258/68104898473.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4C 10904 bytes
SHA-256: 89b683f55dffca15974b258a916fc03a46fc98085e744d31192b1a131c41cdb2
font_01_sfnt_off00010455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10455 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_02_sfnt_off000119cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CD 17412 bytes
SHA-256: 68019aba26608e4b21719235a036476b3f1b2d7b84e9dfc5c9331e6d94aa4d04
font_03_sfnt_off0001476c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1476C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1