Malicious PDF — malware analysis report

Static analysis result for SHA-256 a921082ba05c1034…

MALICIOUS

PDF

89.9 KB Created: 2021-08-17 09:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 905d44475f5070f97b3aebf99864f03a SHA-1: 2575d394b7f7ab63b9505e43f79801a099248ef6 SHA-256: a921082ba05c1034910a0c73327db4d1227a5e3da3a38b09873b1f065e62cb9b
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient for a high-confidence assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607abbbf8eee9---74595814401.pdf In PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/du9tsh67ktjttc35ok8bhi0ff9/gomavoridukiputevanuwivit.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/18119382737.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa5f54f564---baratavenosidabefofovuku.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/vonefowimevuke.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/9279b1de6ec76310ade6c57a087851de/radinetamupul.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f7712a4f8---57871882276.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/mezemapidotitev.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/10397155552.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/ludavunifixemetozuzesabux.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/45e6696978a0b459e217ab7ef3075053/83010112253.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ce672f25fa2b79e0a3729ec952cef7cb/12494955819.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/muzibekeganamowudolafak.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/nuzedogaxapezawixuluze.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/8994299800.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/lrbstjn38iotiiau6kk5raoesm/41655822664.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/ao3l6pigfk6q76ueslebdbpa7c/71808474131.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/f6v79kesdu34j3vb9rg55kcjpo/dozabujokukebavilipix.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b948a4ea5c9---90466471004.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/90011754639.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/65cd64830cd4f8173685a8420a197e35/69731789975.pdfIn PDF document text
    • https://xn--80aggmy8c6c.net/UserFiles/File/22129263529.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/5506886039.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+read+aeronautical+chartsPDF 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_off0000fae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE3 17588 bytes
SHA-256: ac484174638d2aaebbec1064d7da0b48b184eb0feac533d4e42c66af01c51451
font_01_sfnt_off00012936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12936 10644 bytes
SHA-256: 689d6e48be51b052ac9cf731fe3d0efa4d3caba5b08c49b9ca92d412d4739549
font_02_sfnt_off00014185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14185 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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