Malicious PDF — malware analysis report

Static analysis result for SHA-256 787c252a663f0219…

MALICIOUS

PDF

82.4 KB Created: 2021-09-16 12:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a521eccb1566adee5318170a53b684e0 SHA-1: fee430c641ec6e1ce39ea97d420596d8eb4d095b SHA-256: 787c252a663f02193d052279c2db7f7150fb0c1b6c3d50e6311eb153899dba4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to disposable hosting or compromised CMS uploads, characteristic of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to exploit users by directing them to potentially harmful external 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://dwornawodzie.pl/userfiles/file/93830066771.pdf
    • https://kimansion.com/uploads/file/sunerumad.pdf
    • https://ski-valloire.com/ckfinder/userfiles/files/50405198375.pdf
    • https://media-get.ru/userfiles/files/62913121597.pdf
    • https://digitaldaya.com/imagenes/file/93152174060.pdf
    • http://mastera-mix.ru/ckfinder/userfiles/files/33703473921.pdf
    • http://distant-property.ru/fck_editor_files/files/sikejepigikozap.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/nulna1amhgv9th022bmp6gliqb/76101550351.pdf
    • http://arcos-eff.it/userfiles/files/vuxewagagatimurilanajat.pdf
    • http://webmba.fr/client/logo/file/4806892017.pdf
    • https://apskarota.org/userfiles/file/witonowekob.pdf
    • https://kimcert.net/E/file/20308882784.pdf
    • http://longruiglass.com/ckfinder/userfiles/files/20210903_002727.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/sgonvc50283ivabj6rfsal4d37/jemimamusogiviwigat.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f87636f496---24873042481.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/3984d57e1f89b933124294b91c5d40a4/gaxopebofugiridifu.pdf
    • http://vaonhaphatphap.com/images/uploads/files/ruvefa.pdf
    • http://woodlandhills.ilovepokebar.com/uploads/files/maguvarokek.pdf
    • http://ivankotov.ru/img/lib/file/basubewemojigujeronuzele.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/5abe59aa7a20588977a1cdcf7cc99e13/99494334219.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/601c53929360a3e6fe132fe48d58761c/fumejorubalate.pdf
    • https://editionsitaliques.com/userfiles/file/muvukoti.pdf
    • http://abpjse.news-read.com/upload/files/kajarabisubiralusedomin.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f65717051---14180686133.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=all+i+want+for+love+is+you+cast
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc95.bin
c5c5d39545c9bcfa90abd8e201e26b38accd493e88f7264c23d2083d35cbf329
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC95 17716 bytes
font_01_sfnt_off00010ada.bin
d23f3cd44aa409f55fc4d8c39e9376127639eb2054eef89e1a5f15dd957085eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADA 10676 bytes
font_02_sfnt_off0001239d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1239D 16792 bytes