Malicious PDF — malware analysis report

Static analysis result for SHA-256 f546765e346727ca…

MALICIOUS

PDF

84.1 KB Created: 2021-09-08 10:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 066da0d0ad7f8117b7821e929017e36d SHA-1: 49d03d2ba2b23ee224ac70fe5c62d8095c57e913 SHA-256: f546765e346727ca4f5605b8ad184937e16b235e233fe993b52e43bfebf6cf70
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://queure.ru/uplcv?utm_term=visonic+security+system+manual PDF link annotation
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/765fb6f36c260a0b05cf27530f8959bc/63690561238.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/40365233505.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/mikolev.pdfIn PDF document text
    • http://smn1970.com/clients/d/d4/d44d2684521ac238e4bdef02d06179b0/File/daxobafeka.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/71486584764.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/gufosenunivis.pdfIn PDF document text
    • http://ubest.ru/images/file/fibajazopukululed.pdfIn PDF document text
    • https://curryleafharleysvillepa.com/hang/userfiles/files/jekapibajeziwagivazisol.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/c15959bd775f0913aba7c9b20613195c/73826024193.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/5012870177.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/50083418818.pdfIn PDF document text
    • http://khocabien.com/uploads/files/98746776442.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/22734749673.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/60bdf306703a7a6a6c02e5958d9a2542/31751769105.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609babd18277e---79459169822.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/83570513038.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/51556817305.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd47ee7ddb8---75055430563.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610dce8a4e176---dojurizidijipivalokenufu.pdfIn PDF document text
    • http://parkwaywest1974.com/clients/861606/File/33214954128.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/l5sbfoslmqo6q5usnu7erv4pu9/valuwaduzojebujanulo.pdfIn PDF document text
    • 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_off0000e39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39E 18060 bytes
SHA-256: 389b4fb24ffc99bec9118b4eab7ad1c2dd141cc8ac6ac5e16bd1aa54a4940017
font_01_sfnt_off000112d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D6 10576 bytes
SHA-256: c02e36aba82e09ca76ffce38882479f6a3b78c08b4eac3bff8a8141cb85a0ffa
font_02_sfnt_off00012b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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