Malicious PDF — malware analysis report

Static analysis result for SHA-256 827a13b195cdcf27…

MALICIOUS

PDF

102.0 KB Created: 2021-07-30 19:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9e236d89032bd94382fa0c74861f0241 SHA-1: ded9438ef03a2978e8829705ac26ea9bc9b63164 SHA-256: 827a13b195cdcf27b1a1da27a64fffc2f74cbd11b3e58672bd2385285c58c7d6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm and a callback phishing lure. The document body is unreadable, but the presence of numerous links to potentially compromised CMS uploads and disposable hosting suggests a phishing or scam attempt. The embedded URLs, while some are marked benign, contribute to the overall suspicious nature of the document, likely serving as part of a broader phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sevinctekstil.com/resimler/files/nakojexe.pdf In PDF document text
    • http://ofipapel.org//ckfinder/userfiles/files/kinuvatuguzobadimizetuxi.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/23488202577.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/92453688053.pdfIn PDF document text
    • https://telorgabus.com/contents//files/lipizuduvodagun.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/tewufatuwofazilakonozaru.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/2664448108.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b78739ed5c7---63838600065.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/24727436821.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/26235beac2a9efe6fb604e4976f75c27/31958975073.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/xilis.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/76129280501.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/mudulepidilora.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/af25b7d62f9e88ca2211bcc070e38147/60122251569.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/80132602264.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c47839bfb---bafigixodifasupuseg.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/33192573136.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3e519ea49---kuvolowo.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d54c54da9---pavavobewur.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ea1484e84---nijebonusuvupokuvugo.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/rewoxexaxenugowogi.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/70591731779.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/14526ac902e9d92506d7990034d2bc15/70072456981.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/29252965566.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e4ef0ba8d---39897392615.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/gh1hthlue2jo7lv6kmk9lnn874/57997732411.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=gta+5+cheats+ps4+money+glitch+story+modePDF 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_off00011a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A83 24936 bytes
SHA-256: eddec58b070df8cc45a00f42280782d871224c3bd551b40b4ac21002a75410f6
font_01_sfnt_off00015696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15696 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EAD 11324 bytes
SHA-256: 84bca94f80201e6ecd8245c8332ad36bd45dae129b7df91c0078b085bd3e72e8

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