Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f0ace06888d3628…

MALICIOUS

PDF

83.7 KB Created: 2021-09-16 23:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6fa07def870869c40bb6a3ebc36ec1f1 SHA-1: 595ea556f6715bcdf89825fda91ad15b34cefb49 SHA-256: 4f0ace06888d36287533321db86acce272b1ae8b3baec26f8b2342eec9e5b1ec
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, pointing to a strategy of using SEO-optimized links on potentially compromised sites to distribute malicious content.

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://auxerretv.com/content/public/file/sasekiganomuli.pdf In PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16132369696f12---pisukabir.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/55708994777.pdfIn PDF document text
    • http://asvpp.fr/pdf/mabulesagalimovubarusozil.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/86106654700.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/161419d7659e7e---toxujamulefunigexori.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/53266190904.pdfIn PDF document text
    • https://harom.ro/files/file/rukatunevumotuluten.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/zagowukiwumedagepatifut.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/7a1ae5a00b14d70a72b3b655523bf1d6/zalarodesevitekefamiwej.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/wavegovekebuvipaxoro.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/80923382826.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138079c39ba2---rogiwokitaporirikilokam.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/70039395918.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/50061597548.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/38073386730.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344c559c2ca---51997446725.pdfIn PDF document text
    • http://becucci.it/userfiles/files/63567101139.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/43003126020.pdfIn PDF document text
    • http://patroha.hu/file/26853150004.pdfIn PDF document text
    • http://reichspfarrer.sk/file/buxovimolulav.pdfIn PDF document text
    • https://bazk.info/public_htmluploads/file/95799711061.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/92299604465.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/xarimonijoladiri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=movie+maker+without+watermark+free+download+for+pcPDF 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_off0000e144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE144 11052 bytes
SHA-256: ab94f3d3b840a084db16ec935ded5af3756242be08836ab3f6c7ffcf18a4dd0f
font_01_sfnt_off0000fad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD7 17792 bytes
SHA-256: 02f6016952b1ebf329b2d496a3792551081e03813adee580128ab19c6f4fb8df
font_02_sfnt_off000128af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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