Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a4febe714fc690…

MALICIOUS

PDF

78.9 KB Created: 2021-06-09 14:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d21b1792593ae42a739fe2f29b926d0c SHA-1: 124ab140d99a96ad6795cb671bb7a65409ee7b11 SHA-256: b3a4febe714fc690fcc49292814b325472c8b9994c1bd8a2856d2ab487e0e656
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress sites. The document body, though heavily obfuscated, appears to be a lure related to 'Aristotle rhetoric book 1 summary'. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution. ClamAV detection as Pdf.Phishing.Trojan further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=aristotle+rhetoric+book+1+summary PDF link annotation
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e04ae2a4fd---49705499814.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/45030e72ef9914a7a0af27be77820660/watusafojerof.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/25210946150.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e53ecf9f9---puzepofanezuj.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/e36dc6a4e2293901323d2175d2d1fb07/fefibaxumokumiwi.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/27bf8e972f0f49141ffe10462b9123f0/1957966866.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/c2ubkkb1jiltlpbpdgfu9cfnhm/kejizisu.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077cbb9a734e---nefevi.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16092e62acb7f6---gosizutegolutitosusa.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/josonekeje.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160bef66918422---83308020673.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/kivuluraxuzigivulabuvu.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/9819661987.pdfIn PDF document text
    • https://schmitz.cz/res/file/modekosavimodafesef.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf177917ea---97361721036.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/piwiwobexovitifipagadi.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/kb61e32fsece5vf9lmtqblbq5c/856537373.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/1jgo5o32fgdnqdc51htqi691u1/zilejesaresepoxi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DE 5384 bytes
SHA-256: a051b24086b7450d1783f3ca65028f3663e9d99bc5a9d798e0c89fc620f20386
font_01_sfnt_off0001090d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090D 11164 bytes
SHA-256: e0452ee3cb8f4527ec1749b3f2e0c8586ddc8d6fb2039de130eb6bc8e4f6e1c3