Malicious PDF — malware analysis report

Static analysis result for SHA-256 76c36eb4a91a652c…

MALICIOUS

PDF

111.0 KB Created: 2021-06-14 23:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 01614719232ecaff3ad1870113e47fc6 SHA-1: 5916b54f3539df33c9f7681e5858985552221d0c SHA-256: 76c36eb4a91a652c8546e1e7036f0edc8432ec4055513f8fe430a8aa82742ca2
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The primary lure appears to be a 'sexy free massage' offer, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads.

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://irlanc.ru/uplcv?utm_term=sexy+free+massage PDF link annotation
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/e94971f157e75e622c755d6fa1bb3581/kozegorev.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/f023fe7f2aa6f996f343f57c94428525/fosadinom.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/42309184322.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b96cae89af---nejijisojodeteganinog.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607764f79d271---vasuzesaguguse.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/14a287c517901139695ed46d17d85a6b/negajaxabadujoxe.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/24450670025.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b0876b9a968---23921725362.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1f50b6a825c71e18f1fce96a7c0e04a3/puvokeseledofemujerixijid.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/vuteramuxusefupijobojufil.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/62483679107.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/19409772573.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ca8aa4165---72033602497.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a74b94cb8---vepepaziwuvamopaz.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/gogopipiri.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/16ba28a04c69db418568da6f3937194b/bixonez.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_off0001795f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1795F 5328 bytes
SHA-256: 66e25cd44c76434387fcc79e35e55e3cbea44e93cd97d95817a06485ba03f326
font_01_sfnt_off00018b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B76 10612 bytes
SHA-256: 13fcc6d55646c14184b90b5eb7d4c23ad379921b0db868d32d387bd44562966e