Malicious PDF — malware analysis report

Static analysis result for SHA-256 82db21259ac792f6…

MALICIOUS

PDF

70.7 KB Created: 2021-06-19 07:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 7cbfe24cf8e1a8629bafdf2b66f708c4 SHA-1: 020a14460c500b958acdd68cb35f576f5c4d123c SHA-256: 82db21259ac792f614f325bf683fcd336134258c99d5eb7e0c43ab0f9e37c2d4
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, likely intended to host malicious payloads. Heuristics indicate a high likelihood of malicious content, with ClamAV specifically identifying it as a phishing trojan. The presence of external URIs and link farms suggests an attempt to direct users to malicious content, potentially for downloading further malware.

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://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764dd4c794e---64631961259.pdf In PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/4maruuc8p4mtkeljo1fggl77n1/13247190496.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/2a5f5ff6886ccaf224cfa5c67421f585/guzunalovitofiwep.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7555a04a77---gorujadaliwezusezi.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607de5cfcda22---91695272927.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/7b29fe5e95484d5a22b464574467d78a/18941305632.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a0d55fbd6---75714813108.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad3377d823---satibiduz.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888f2c7961c---nomadu.pdfIn PDF document text
    • https://serka.com/serka/upload/files/vesulejimepovitikofilozab.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/efaca21c753b445878aedd33932d7c55/mamov.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d19d5297d0---maxosojiwozuzaxokoludus.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/64df4a32edf1e502d86456f9e8fde00c/67622769315.pdfIn PDF document text
    • http://roweryelectra.eu/app/webroot/uploads/file/16204807983024.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083edc386e89---bisunininusepabop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=flextangle+template+patternsPDF 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A0 5164 bytes
SHA-256: 7cbc2c7c9a9bc0b0bfb09dd6876504ec322970ca7b8fb59808257854fc492fdc
font_01_sfnt_off0000e921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE921 10692 bytes
SHA-256: e83b93be44d29c3c2cbf6adb0447ec7d1303d04041e8b9101e5ce1cfc70cce2e