Malicious PDF — malware analysis report

Static analysis result for SHA-256 beeb577b6ea7f486…

MALICIOUS

PDF

89.0 KB Created: 2021-07-21 13:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cb7218ffee9151aaaa3c693b02141804 SHA-1: dba9feba28accd27b80c6ab94a4dc1805d957983 SHA-256: beeb577b6ea7f4864a5c55728152bc5f22841631f8304fbc3e20204ee891db65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting it functions as a link farm or phishing lure. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further support the conclusion that the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/27ims42gaaopr6anak7vdvhanf/solager.pdf In PDF document text
    • https://vicotelecom.vn/static/source/images/file/dafosalagovi.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210507060125.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/gixexepapusetukuzutol.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/dafibugotitilev.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/36a39d8ef4844f96d33b8f4c4d98619a/62844267902.pdfIn PDF document text
    • http://olneyjune65.com/clients/d/dc/dcef5d22f85ec69f5810ba62c2e8cf46/File/daxakubobepivagowuvisagef.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b09f5f718edc564a2280d230bc36f101/39963865952.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210607_015545.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/41897061972.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/91894548fbb9174a345310d35c2873cc/8685147699.pdfIn PDF document text
    • http://secretinvitation.net/images/files/76153246174.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/2287bc184c4f4640fdffc39363f8ea85/lufepini.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608549dd33df6---gapowuxedesat.pdfIn PDF document text
    • http://shihtzufurbabies.net/clients/d/d3/d383cf0c90cf2d2391705d5438694b4c/File/82360432351.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ehkajso41rtjrmrhaofkit37j3/90799120320.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/8624303106.pdfIn PDF document text
    • https://eviinstall.com/userfiles/files/99409313258.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/zunezovuwaporajexe.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/80772390371.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/14312014188.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/84ff5ba4484d2f99b6a49c995d2556d2/91865707407.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/39285494422.pdfIn PDF document text
    • http://etre-belle.su/images/file/3774397008.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/p36u2iplirdiafqbempnl4ip9s/sodulopadamuko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=ways+to+describe+waterPDF 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_off0000face.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACE 16404 bytes
SHA-256: 11ba86b3f6a7bccbb3bb5385e24c460178f5a69613b0858e69fe0a3e783f0be5
font_01_sfnt_off0001251f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251F 10544 bytes
SHA-256: f436f59de6cdfca749534412ce114f806cba6c49f186c229d19a0a7be53819ed
font_02_sfnt_off00013d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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