Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f6d98058240c53…

MALICIOUS

PDF

91.1 KB Created: 2021-09-17 10:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 862626a07ecfefe2ba6ef82ac576aecb SHA-1: a2eec83ade516ab2769bf8d629b38982a54ede8e SHA-256: b8f6d98058240c53a62d0e14863b8e86280594401ab5984d4a0097c1864e2bf5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://queure.ru/uplcv?utm_term=gow+2+iso PDF link annotation
    • https://etonbio.com/newsLetters/images/file/sirunaleferojofovalu.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/99637805258.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/guvivobefis.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/156edfc05c7bf40a7cf468c50b229c51/bidedadefavuxo.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/fogakixupomadawowizad.pdfIn PDF document text
    • http://reopen911.info/media/file/timewezuwidilaginigo.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2cc9be11d---sijij.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/24314416681.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • http://carbonelite.ru/file/71389223109.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/44889050619.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/fc8ad96f3ef7c9c49c9ee4c106b678a6/wesavuxu.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/83192139486.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161416a25ddd46---77487823574.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/68161438244.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/12419369054.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/43243111990.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/477hgi8rv0s9h2gb7q5besc4u5/89934071873.pdfIn PDF document text
    • http://jonme.net/ckupload/files/87886258116.pdfIn PDF document text
    • http://friulanapanini.com/images/file/76992134306.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/39652860686.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70297798591.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/laxiwuzuzikex.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/57585294260.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_off0000fe50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE50 19572 bytes
SHA-256: b11d622f727b304dbcb58a7af1987c11c5b814daf29858e8c2bc2c22f3163c7a
font_01_sfnt_off000131b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000149ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149CA 9704 bytes
SHA-256: f0e1bc79ed2250fa82ae4acb546105417ff3a1484cffbffa1704653fd4c1724e

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