Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2a42d25d1de1d8f…

MALICIOUS

PDF

80.2 KB Created: 2021-09-16 09:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e84acb0b062b98fc4ec66b5ec5001134 SHA-1: c6ba31d258c3117a6065910745137bbc34e703ce SHA-256: c2a42d25d1de1d8faf743758e7d43d4727591661360c4e2cf6d3fa9686692985
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many of which appear to be part of a link farm designed for SEO manipulation or to host malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, a common tactic in tech support scams or phishing operations. ClamAV also detected this file as a phishing trojan.

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.
  • 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 https://cructi.ru/uplcv?utm_term=kindle+paperwhite+pdf PDF link annotation
    • http://alrabbancapital.com/file/files/dutudelujodatedif.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/fevijexivedorolut.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/89221522406.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613462b02aa04---38134911838.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16134d80a0d4ca---45880653993.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/libajazupakimiserevulumaw.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/zanigujabu.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/wamamozud.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/xobubewonunopike.pdfIn PDF document text
    • http://119pump.net/d/files/29447343708.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142afb7605d9---33441619814.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/fegevakuzel.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/68238491136.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/janoras.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/56837763441.pdfIn PDF document text
    • http://ildong.org/sa_upload/userfiles/file/20210913184815.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/zuremezipofepaduxuletu.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/47790404908.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/84027803276.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/77645370103.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/zoginakitekegixovev.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/49253761542.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_off0000d90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90B 16576 bytes
SHA-256: f4203ee4164b18070a559574c6ef270a9a90164f9f381392a76ddf2e427e39f9
font_01_sfnt_off000103a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A7 10384 bytes
SHA-256: 9bb0138f53e45d6d5378a8ce48fc22df6a55d4c317bc80d5d68fa99a58099e67
font_02_sfnt_off00011b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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