Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c57f2ae1360a88…

MALICIOUS

PDF

112.0 KB Created: 2021-06-20 18:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: cf45583c4ebbfad4367fb11145d7095b SHA-1: 4d364cae1323fdc1944af8682f6d9a700b149d4d SHA-256: 77c57f2ae1360a8845ab10130c0ae7b6481bdbf64729995663c55cecbdad3cbe
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://irlanc.ru/uplcv?utm_term=call+of+cthulhu+ttrpg+pdf PDF link annotation
    • https://cometsecurity.in/admin/userfiles/file/fasekoxizapasorimupisum.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/makumoluzojos.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16071660d86fd3---97061963058.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/8c8b0038e2961c7f11278cea8fbcdc92/42787115677.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c24dd16c0e7---kojujudabobolebopuxojewof.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/darok.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/c8951603b7e78f2f5af0aa59991c1130/lekidobodexo.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/09e5b1692bafefa1aa3271f6ca663e08/jovigik.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/48d3c5de2bbc9ae3baca4593493b1426/sarabosepo.pdfIn PDF document text
    • http://cycling-software.com/files/file/63510163369.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/fgrong8avdnhth3f6khf3p72dk/gatiwedifabunoj.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/rolafuf.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/nvc5gph93ruhnmralc3p38176g/35113975572.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/de566c7896e02407cab44c713c5c2c89/bilozivadunomisezib.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/66152349104.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/d033e700bd189a21c695bccfb94de767/74500263991.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/siehdgpmfjbn8b7o7668lrh0f2/73084280694.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B8C 3044 bytes
SHA-256: 18b052cc7ee1af0dc28d02b7ba609d7f268bc348feb7db5a5451a39709b7978a
font_01_sfnt_off00015660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15660 4872 bytes
SHA-256: 0d53f80bba6e04fc9bb8eb1b9fd93076b903c6b9b9035c14ac44f51367008c66
font_02_sfnt_off00016707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16707 11848 bytes
SHA-256: e26b50cdd767dc988f1bacb9880e11eca89fe2126070a80d93ba4b16b2c5ebe1
font_03_sfnt_off00018f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F21 16060 bytes
SHA-256: 84d5bd19c210eb3b73ecc14096ab1e56fdfb5b80ce7ba4f0052c67c0c2b02727
font_04_sfnt_off0001a3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3B4 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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