Malicious PDF — malware analysis report

Static analysis result for SHA-256 936c30c63e5c0576…

MALICIOUS

PDF

101.6 KB Created: 2021-06-25 10:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: c1036b1a811f667171177d34bdef04ac SHA-1: b225b404e043d3dfd8f76242fbdbf6e3221c8e4b SHA-256: 936c30c63e5c057621259dbec8b1df36cdaf578dcb726f7fe7c765b8619379ef
156 Risk Score

Malware Insights

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

The PDF document is classified as malicious by ML and ClamAV, and contains numerous links to external websites, many of which are hosted on compromised or disposable domains. The document body, though heavily obfuscated, appears to be a lure, presenting itself as a 'Volvo penta 120s saildrive workshop manual' to entice users to click on the embedded links. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://vencedor.coop/images/admin/file/7920298449.pdf In PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d90996467b---lanimewiviguzarif.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210518012349.pdfIn PDF document text
    • https://seerupit.dk/assens/file/ropuke.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bf82b68db---71348866046.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608120b2dc12c---348570222.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/worevazuje.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/30cf6ef136fb5951875b9e76f81b6ea7/giwunuvunitij.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/9719819084.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/332d32c4a5d098b0560e6a513ac452bc/kirenabuzuvivubon.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sekevitisozomenamafuwozal.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/1782f3df96d55f69f720d2dbd53dcabb/siwajefajuwakato.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/iickaip592ungnp14dn4pi13cj/pinerolawemugijoruru.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf58289662---84760803349.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/qfb5ana7k7sji5e8lg8t8anul4/rizobumeguxulir.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/bc16ce916481f72e007ed9a1ea8ff47f/wodavineke.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/50a54fca5345cdbe3a2239fb8755c922/59722543457.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078c2afcdcb6---febisisawovimukovubazoj.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
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=volvo+penta+120s+saildrive+workshop+manualPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FE1 5588 bytes
SHA-256: ee1b3caf04b2fcfd6db061714b5a37ee34b85fb7de798cac42214b22710e46cc
font_01_sfnt_off000152c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152C4 11524 bytes
SHA-256: 77a92edbe22ad832813e3de397bf52c6f0131b9dfaeca39eedd846b93def3e43
font_02_sfnt_off000178af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178AF 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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