Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fa72e238098082d…

MALICIOUS

PDF

93.8 KB Created: 2021-07-13 11:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 30bf94bb5b14277c7b22e01361e38036 SHA-1: f7dbb130738cf5c557621570fbe79a6ddd386f83 SHA-256: 3fa72e238098082da74fc3e37dc1bb0dde6e40a0647a0aac40c02f026cda008d
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. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The presence of embedded JavaScript, though not explicitly detailed in the provided evidence, is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://infrive.ru/uplcv?utm_term=class+10+science+acid+base+and+salt+question+answer PDF link annotation
    • http://lifecare4all.com/upload/files/15007748237.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/betizazaviwix.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6caa43cf1---39756829408.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609433b8ef8a6---nojipalezelodeno.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/8q6ekarmtajvnn1lnht79rddd4/98889243965.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/9315b8fb0d0ec41540931e4d368d1372/99297186075.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/496372a7c6d1f69d08bfb6548fb80a20/rizaperuwusonafeg.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/09hjo6k928r9ut8qhecdpuuef7/ferifebupoxabuluwizemude.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/purokuziwe.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/sagopupegagatelariko.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/6f973a33e2200d6e30ca6f387f915f6a/donimijegetaxiwedunufi.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/gedopa.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/96938767502.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608deb4508d28---guxikowatemijurop.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/c400228009a67f99e5a03301486b75b0/10051196135.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/a36f5e6ee34662fcb517e359975c5b5b/16474380718.pdfIn PDF document text
    • http://axwelindia.com/uploads/vazilo.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/764e607451eab188a0579eb7d98f9b21/waruwu.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/55696808142.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607150356e5ce---gufoweviwa.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/kkk9bukeikdg7d8ko0b88l1mb1/52571099457.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_off00010b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001231b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231B 11040 bytes
SHA-256: 94e73d82ce3e4ab40a1b34256f02f4e59c4aacb7ce9ee903bd43f09a4428e87b
font_02_sfnt_off00013cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CCA 17352 bytes
SHA-256: a2a14a44eea4037ceda582d375d452bea6b0c0f342f22ef54a5a4b1e077a4b61

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