Malicious PDF — malware analysis report

Static analysis result for SHA-256 be3b0a28d95c2967…

MALICIOUS

PDF

85.4 KB Created: 2021-09-03 01:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: eb31f6c4273acda5c7dfadf486aae8c0 SHA-1: c4d872f4dc44e34fde8f2c6114157aecb04e3ce8 SHA-256: be3b0a28d95c29676a64f559017459a7e613a6c0a90748757d97f2aa1b3daa28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised WordPress sites, suggesting a phishing or spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, but the link farm structure is a common tactic for distributing malware or leading users to fraudulent sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://eko-inwest.eu/upload/file/modolaxosufo.pdf In PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/368938f83062f3db97055f9262dedb6f/35696185005.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/pelosaful.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec7c226e60---lawog.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/xunapinizirumavox.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1624383073.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/tojuwalixubetok.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16073e6f111f60---1925758716.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/xenugemovasawapepojaba.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/93676784982.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/somunugatilo.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/07b9ac646139cfb53b8dc11703100b44/pixojogiguxotow.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/96404910453.pdfIn PDF document text
    • http://gyobel.it/public/file/73350819106.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f336f2b59e---diroku.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16083202dee3e8---91952096551.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607faf87b2601---vafezozagufajorem.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/raposun.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/78043495266.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751e67d1bd5---mokekisusepirevizunorize.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/91179579144.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/73731506213.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073781bac461---bagojategofonatijute.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/6a1eee8aae7b79e2fa4cfc9b4dceb9c6/muwekezokepir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=rencana+pembangunan+infrastruktur+indonesia+pdfPDF 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_off0000e98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98A 11296 bytes
SHA-256: 041cc740469903ff419cd9e8c3b84f8c365bb1c98975b399f020991f90bfeedf
font_01_sfnt_off000103ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBF 16896 bytes
SHA-256: 594b64d55447981154b368bb9fdd08fff44c33db427c80f14e1e7a45b7ff5357

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