Malicious PDF — malware analysis report

Static analysis result for SHA-256 0048cb71e6023cae…

MALICIOUS

PDF

77.0 KB Created: 2021-09-06 15:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cf9d1a1db20c5438d8a19e02793477b3 SHA-1: dfd5e1741b076b1db5ce8e5e2d79932b816796f4 SHA-256: 0048cb71e6023cae50d4e4b84bc7acbb50e3e1717e7359d538e9a9c68cd03eea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing or SEO manipulation tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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 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.
  • 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 http://domuran.pl/files/file/ximepawadovilalo.pdf In PDF document text
    • http://shadesvalleymounties1969.com/clients/868959/File/82508865967.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/85533322738.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/56257702364.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/vvja9tlsgtmtihihp5alv0c3to/83056046223.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/97640407353.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/2288645736.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/zowunisebufuzuwubo.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/dusemidubifip.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/muzimewonizip.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/lixasisosunonokokofawuker.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/41383207117.pdfIn PDF document text
    • https://duel.pl/userfiles/file/vodeki.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00417a0b02---rumajevixefoburox.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a0aa93b9510---xojokakupe.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1608445f7c1c65---zesuli.pdfIn PDF document text
    • http://rcot.by/pics/files/29178371157.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/dasomazawufesu.pdfIn PDF document text
    • http://indemo.pl/Image/files/menopuzefinasimoji.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/zivivewidologajeb.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/91295957065.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7f4fee07b---lafaje.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162434766447.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=pengertian+zat+gizi+pdfPDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F6 10400 bytes
SHA-256: 242dadb01ac7b5e5865dd6824826030be22e590afd55b6519b54dbabaa4fa6a4
font_01_sfnt_off0000e170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE170 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF982 17184 bytes
SHA-256: ed643aa7a245c03776e73b03205a09a465b118e21a5e652a37e5ca15cbdc5d6b