Malicious PDF — malware analysis report

Static analysis result for SHA-256 265dc4ad74e13a5c…

MALICIOUS

PDF

89.0 KB Created: 2021-06-28 08:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b5107d19cef01aaaf0366f5233d19aee SHA-1: 5f750bea22a238a519a9a9f8bd925c1951d80a9c SHA-256: 265dc4ad74e13a5c3cdbd8177c9049d07c6f0d4a42aa5667a2c44e920dff782a
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external PDFs hosted on compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' lure and callback phishing pretext further indicates a social engineering attempt to trick the user into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 8

  • 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.
  • 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://liantoong.com/archive/upload/files/96334489543.pdf In PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/90af015d1140e1deb9f679d4a26908f0/sivetop.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/jad65h10r8bpm6jjfhsrn8bnv1/26395236047.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8de425b15---rukesalipin.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/jodatejefukigar.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd45977d7e5---70887880565.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160bb83d6d629e---69521683966.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/2275b6d9b1f9a2d45b5a62a2d7c33328/8065130358.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/47782428251.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1609b67c45c13d---85579847546.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/10e46c6d36240c187572674fa6f118dc/25134452112.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/fozaxekivuja.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc28bd1283---29738585132.pdfIn PDF document text
    • http://merwepizza.com/upload/file/42919448110.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a020923b91---regifabusojuzag.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/q0tfjtfmlf8abcd8ahmpujpq02/vizizemiguxabumudux.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/29086666910.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/40cad92723c4bda48dde25dcf5683348/15452169653.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c1fbb90df---56732549755.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/38209562077.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d7dc72ea0---losasezulowis.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/g76sb1fe69ruocs7ib7n0vor47/gasivozolibomonewan.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083202334e3a---45236441316.pdfIn PDF document text
    • http://calhi1977.com/clients/879053/File/66278959418.pdfIn PDF document text
    • https://belloverde.net/emailer/file/finakozini.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/238f15266cc6e16cfb6039715073c18c/62002001063.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/25600427.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=straight+line+jee+mains+notesPDF 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_off0000f84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84A 17464 bytes
SHA-256: 22a52d6550b59da321bfe03d3686ed5ded26abaf806e251256140c9c93865334
font_01_sfnt_off00012608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12608 10760 bytes
SHA-256: b11e8689d81cb306839d44f99ff52659bf139eaa999add925cef0b1f4624ca50
font_02_sfnt_off00013e84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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