Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6e0d61f3272b625…

MALICIOUS

PDF

66.0 KB Created: 2021-06-23 15:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 9a0e45534d368c1a2dd7473c014e3cff SHA-1: dec2e0305595199c9a4ad7241d73d2ba12f8539a SHA-256: f6e0d61f3272b625a14d000998dd65e126f76349d8593feb69670c50fc62a689
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of the 'utm_term' parameter in some URLs further supports a phishing or malware distribution campaign.

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://laborke.ru/uplcv?utm_term=conflict+desert+storm+3+download PDF link annotation
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/43cebf7788b87f9246097b91e6761c7c/dapolajagusuriviperesiv.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/db711dbb1e8e8c481f04f3d9afb5497e/mikakefixevexifopam.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/83849273235.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/sexolagedegok.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf05df32097---sikemojuzudupazezajovam.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/jk5r3ucg4b0ni4cbcl2274d35q/55640137625.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/cp955kt2dsfameg9108khq15d5/gidugakazoxamimano.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/kerm5n922dk35bslnj4rc06ke0/nepodozajaw.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/3a3de9182bbc847d50e8e827cdf52a4a/92569060546.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/962fdbf35040ba53ddda587d9408e1d7/vipugadiboluxetoxoluj.pdfIn PDF document text
    • http://markone-tools.com/upload/files/divavudadujap.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/7314tsk4egmdi9fcgi8jmuopk9/jejabukikakibunidaxux.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_off0000bf27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF27 5328 bytes
SHA-256: c4e2030df0e13032751e5f99ab69b0a1056259fc2886f519e09a03014b5799af
font_01_sfnt_off0000d13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13D 17364 bytes
SHA-256: 5c6ea41b7893c1126617606d19f21c8a633645a706aa13ad16b53410366a6d00

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