Malicious PDF — malware analysis report

Static analysis result for SHA-256 e26c8a8a620e904b…

MALICIOUS

PDF

70.0 KB Created: 2021-09-29 08:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7a79e9c5f9c5c127d25055e5b35b1d02 SHA-1: 093eb9aa6d0a82ba238dfb1d1e73bef4d1cf0042 SHA-256: e26c8a8a620e904bd8708a507ae3bfea9d1c11aec064f698450abf8565d8f2b8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic findings are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://abnigakgdsg.friendship-match.com/upload/files/gewiban.pdf In PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614041426874b---48916508222.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/31701757809.pdfIn PDF document text
    • https://kildevangen.dk/files/10481353172.pdfIn PDF document text
    • http://xycrusher.com/d/files/xagatojupagedobatexigigi.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/kowot.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/cf4e513f7ad6c13f649ebe6212e31b2c/tizigedi.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/mirililixopuwipogabelinew.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/zonodibodugoxozosititut.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f39ba37d51---nalakufefekinufoteritipo.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/93328169135.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/rofek.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/71719008934.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/sejibodogujulabolemajogaf.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/13649980799.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/91908952327.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/botejisamoku.pdfIn PDF document text
    • http://lblussana.it/images/file/bobojuvefemuku.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161425154548e1---jepoxesaro.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/59954411656.pdfIn PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/79371095304.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/9mp509nu6ph7biu253tttsfop0/robametu.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/nemigop.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/xemalivunaso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=schaum%27s+outline+complex+variables+solution+manual+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_off0000afc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC2 11400 bytes
SHA-256: cfae42f4dee3e550ce9741a379150f9550eee668221ff8328445b9ff996ffca5
font_01_sfnt_off0000ca4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4C 15600 bytes
SHA-256: 0bad1af82b743271a333c82f5d0c158376b9195ab979d403e994b34a60db2d6f
font_02_sfnt_off0000f22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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