Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fca2b2ed2400fdc…

MALICIOUS

PDF

80.3 KB Created: 2021-09-09 03:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: a50e0ded84b5756978267168aba0d4b8 SHA-1: c924dcb10157e7dff1e842d90377f4f59bc26a11 SHA-256: 8fca2b2ed2400fdc4b9e8a17085189d108abee5a29a45d99425563188f9f814e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious workflow, likely involving the exploitation of PDF viewers or social engineering to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=how+to+set+ringtone+in+pixel+4a PDF link annotation
    • http://alde-pace.org/ckfinder/userfiles/files/96529495411.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/padagataliwed.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/29118776710.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/xutig.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/28919998955.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/subowu.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/rexozipofewabepijadalava.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16137f1c403543---23623068384.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/66800651763.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/78063889334.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/32232786222.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/vaberitol.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/taboraf.pdfIn PDF document text
    • http://www.grifin.sk/files/91949530360.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/zepolimaguxomimikavexaxe.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/40981194069.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161380cf3c52ab---22140382492.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/3927476229.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/4a0521a14bbdefdf605fdff2a35f3d8b/48100552105.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/25318004335.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134d87602d0d---bevadulogetofe.pdfIn PDF document text
    • https://glozor.com/userfiles/file/92677990197.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0B 10684 bytes
SHA-256: 70ec66d6f56c408fc00bbe39bcbd1473bd5d346afd795a7bdca1230830e303e8
font_02_sfnt_off000105be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BE 17976 bytes
SHA-256: 1d32674ebdf553aacc222c76ff02be1ddcc80035d71f088801f33db983e15b05

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