Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7bf5fe7852366e3…

MALICIOUS

PDF

80.1 KB Created: 2021-09-11 21:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 425ba35adc723ccaabc59122cdff50b0 SHA-1: a2cec43bd6f887a948b44a6a4b8b6a414b15e611 SHA-256: a7bf5fe7852366e39ba815766200cd6c07bc1932f5b5d51e80329a7b8ac728e2
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on disposable infrastructure or compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/3840a3e2b8bc96cd331e8cc3cff1d9cc/73534957646.pdf In PDF document text
    • http://exito-opakowania.pl/userfiles/file/28287817776.pdfIn PDF document text
    • http://marine-inox.com/i/File/50544755603.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/65369672575.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/2d4d96cbce786f269831bf86b1f86a34/dakagekirumeliwebofasot.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/gezefuwabibatewumote.pdfIn PDF document text
    • http://corkpotters.com/images/xogujejas.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/wiropoxuxod.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/vejazifuwatofi.pdfIn PDF document text
    • https://pindimana.in/uploads/file/49700044595.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/tipebedibuza.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/27250604714.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/fiwudotoxabilefiwuguger.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/53706582499.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/valafakupubejorolofuxafu.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/fosevegigemebebasapos.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/92962047237.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/89807590098.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136a29a00605---nuvolikonexakosakuwez.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5c1428b97---45869748905.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/11282178770.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/0f6328c60b68ed15ea1dd53ddb4aa8a6/10684659540.pdfIn PDF document text
    • http://beta-rc.com/upload/files/54809007649.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=nokia+pc+suite+apk+downloadPDF 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_off0000d718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD718 16740 bytes
SHA-256: ef834cd053badee4aee4a01823d15ab766241e53e5d012ceb8384cf29881f17a
font_01_sfnt_off000101f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0B 10660 bytes
SHA-256: 91c0d93c03ca2fb198776397da0e53684acae41f1ed7214188fa84473039310c