Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1bd929d7160a250…

MALICIOUS

PDF

97.9 KB Created: 2021-09-05 04:36:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b30ee296212721861ff0a2bfed907a78 SHA-1: 31e76bf4345375e563956e73968afadbba9170e3 SHA-256: a1bd929d7160a2504833a4d7a1b64fc7189e5a0a1efbf73133a5325b45869b57
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised WordPress installations or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristics and URLs suggest a link farm designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://kingsfinancialconsulting.com/userfiles/file/71712454615.pdf In PDF document text
    • http://stroytehcentr.ru/images/file/nogudejidiwaresovuluv.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/roruniv.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/99443768231.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/bosewuzajemoxopuniwedo.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a195f21c67a---92370040182.pdfIn PDF document text
    • http://vienhung.com/webroot/img/files/rodowejik.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/guwoki.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/44190841651.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/1c5e7c143a35ae1ce271e4f6f26d9ced/pafemivakowajodimurixa.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5c24d1676---54543720623.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/weled.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/e046bda351dc04e750cbaa43f65685bf/wuwubewiparotikupamo.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb9747f0ae---wikopuxofobu.pdfIn PDF document text
    • http://derma-dts.de/files/file/lirikasaxuxinu.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/melizifakujoxoziwizejid.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b40808ec---22820127221.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607550c46f669---42035680263.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708f96c9089---vifijunararijediwi.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/98363324979.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/369fe842844852d24ff40aed38902a86/60235502877.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1626748340.pdfIn PDF document text
    • https://verner.lt/images/files/15593782310.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/9854224862.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=introduction+to+wildlife+management+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_off0001197d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197D 10932 bytes
SHA-256: 730357c2a0ea882b486ca1bd926468017472d695fac7f419fe1c96281627a219
font_01_sfnt_off000132a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A0 18116 bytes
SHA-256: e112ef74ac12d725632d90bb394565ab2951851d29bcee34a0d70fc87cfc6903
font_02_sfnt_off00016192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16192 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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