Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5edcbaaaf0020fd…

MALICIOUS

PDF

88.0 KB Created: 2021-08-15 18:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d4438496ecc3cab05f6064464579fb6a SHA-1: 563c96d38d606d044e30db41581a27f6d066abfe SHA-256: f5edcbaaaf0020fda0ac4e3ef2e58d495a7ac0fdd56bd63e4ecc1b305d6449c9
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing campaign. The presence of a 'download button' lure and a callback lure further supports a phishing or scam intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://inwebjor.ru/uplcv?utm_term=android+10+xiaomi+redmi+note+4x PDF link annotation
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b35f5570d---29873406385.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/pitexepaniwuxeparosem.pdfIn PDF document text
    • https://gomaihoa.net/upload/files/63041672502.pdfIn PDF document text
    • https://artenika.pl/fck/file/64692406848.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/gokurenexuxebebo.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/3cd66ca25a7cf8bd7da9c761e9a6770d/setubevebafekinegaf.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/4ibeoq04tjp19spahfbljcvv1o/82945184775.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610deb51c9aaf---41362679952.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/d90c8ae2f27afd367964b0f3ab5088bc/32803507119.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/e68d4ca007174d803b9f452f297a59df/rumemelolorakazixure.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/85af84f45687230256c6fc9e8d2c5690/dijisilegotuviwotipogixav.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608429ba1ccca---51490539034.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/tadavobulagozilu.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/1736b71c2b20ed9dc298edb9744cef12/36463665635.pdfIn PDF document text
    • https://adreshosting.com/calisma2/files/uploads/wowozalexumerebevij.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16105dea483325---fikiragaz.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/56424196244.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/aa96e22668012338df68cc13596a1964/gisozutagabor.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/retej.pdfIn PDF document text
    • http://proxkimya.com/resimler/files/ketetupitop.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/1573565012.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/45416736947.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a02ad9c543d---81610924063.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4373d3d1f8---75285939340.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/19596954224.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/47049312876.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_off0000f24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A62 10532 bytes
SHA-256: cd188d48500e153ce8d91c62e46dd581b7fae443741d87bf5e6a529360cf023e
font_02_sfnt_off00012268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12268 18116 bytes
SHA-256: 63e2302d2ee4e3d20789237a8e785098e73276417e167761dff1c947aa0aca2e

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