Malicious PDF — malware analysis report

Static analysis result for SHA-256 93bcbbf00c17dc53…

MALICIOUS

PDF

87.1 KB Created: 2021-07-07 20:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4288ef25249f40ee42cacf90425ad4b6 SHA-1: 7a2213af429f6cf12941b0fdde3a5be5d2388575 SHA-256: 93bcbbf00c17dc530fa7984d2b23e47488bb520fad0b7d478430af4535b56b7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document 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 to malicious content. While no scripts were explicitly extracted, the nature of the links and the overall detection suggest the PDF is intended to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://cructi.ru/uplcv?utm_term=vocabulary+words+for+class+9
    • http://yngc.ru/admin/ckfinder/userfiles/files/negizelo.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3a8053317---xapazu.pdf
    • http://beerskiboot.de/img/upload/file/81475782919.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/u24ef41a649qv21fuuhgfoqao5/1163189847.pdf
    • http://emaaravm.net/upload/files/89252769825.pdf
    • https://weeb.nu/userfiles/file/texutuzebivopibowosofagul.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e431f96432---tirox.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/cee42ed41ff846879487c25a57907339/lobimevuroro.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/aapv6padboteasg65o6rk5cv1l/nejoraxerap.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc63d6ac159---24098154720.pdf
    • http://www.empresshasnoclothes.com/siteuploads/editorimg/file/zigadexuduvevokofabiso.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b1cc55dfb---leforivipevokazizikufenu.pdf
    • https://alianzatours.com/imagenes/file/pakis.pdf
    • http://andreaslasnik.com/data/files/43899177747.pdf
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/9083451e3199cb5883582b9650d7aa3a/volininusilurogeda.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16084ffe4700d0---fumimugogijukuxo.pdf
    • http://www.darvidproperty.com/news/file/71419682410.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/ce8fbcae523f0e934ea6bcef1f775e70/kivafitemapapigowunenum.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/9pe8nv13i2ep1l5nsdlbjlv693/58716199974.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090f749c0283---70859148475.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ukqgcdgrrm8l55kqm91psr4ln6/vafiw.pdf
    • https://tangentemag.com/img/file/54309125940.pdf
    • https://istocdukkan.com/userfiles/files/88010313736.pdf
    • http://e1pl2.nazwa.pl/busy/fotki/file/xonowazapifixuweminovales.pdf
    • 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_off0000f1c2.bin
9df5a2ef0b6fa1c178b800455e66897a83410d9222c3e6443c0084b65841d227
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C2 10620 bytes
font_01_sfnt_off00010a46.bin
b2585ffae67950edfbfe09133e0d3530da78546b219c6956b610ae2c2ebb8132
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A46 16700 bytes
font_02_sfnt_off0001357a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1357A 16792 bytes