Malicious PDF — malware analysis report

Static analysis result for SHA-256 46a88b90dff75107…

MALICIOUS

PDF

79.4 KB Created: 2021-09-19 22:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bc765af33c147a5cc4275f05a8de19e8 SHA-1: e41bf0aec1bb01706d88e86b9b8a4f3af8f484f0 SHA-256: 46a88b90dff75107f512a398c413ab5ebfc7370be16f331f90e0a2389b3bb36f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it's a link farm pointing to compromised CMS upload storage and potentially a callback phishing lure. The embedded URLs suggest an attempt to redirect the user to malicious content, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://jobsmarttampabay.com/files/public/58200857742.pdf In PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/98333661788.pdfIn PDF document text
    • http://mastervin.ru/files/file/5470420139.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/numumufa.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/wetuluwemepoxu.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/8960380137.pdfIn PDF document text
    • http://yljczl.com/uploadfile/20210919230245219.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/87551795816.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/99357956678.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/titesazu.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/41250882189.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/murixoveritig.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f453a5f689---kamalu.pdfIn PDF document text
    • http://ud2-140.com/files/90520366989.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141638fc2927---72848322884.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/tuvakelupisemebaw.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/muzuboputedereritubebe.pdfIn PDF document text
    • http://happy-land.hu/editor_up/nasirakivado.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/19519967518.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/50367692873.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130547db21c9---60140101537.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/futasu.pdfIn PDF document text
    • http://bienbao.net/uploads/files/radobabibekirofub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=mega+mall+story+2+apkPDF 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_off0000d239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD239 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4B 17344 bytes
SHA-256: 2c812a65acc90e11b7c329fdf64a9a4b744855e1876b90862623b30c35c77893
font_02_sfnt_off00011775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11775 10720 bytes
SHA-256: ca127c18681acff202ab6da323bdbf582145c2ed7293c5e77252c9c07b67ec47

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