Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c415b37e7a1fb78…

MALICIOUS

PDF

84.6 KB Created: 2021-06-08 23:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b750158bb4184bbacbbb86adf3bf02ea SHA-1: 5395219744fb1bb660d88db3dad116462e78b5b7 SHA-256: 6c415b37e7a1fb788a5374ba102c582c36d3fdf6f0a7ffa88ea0bfb39411ab0e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress installations, suggesting a link farm used for phishing or scamming. The document body, though heavily obfuscated, contains text related to applying for a Canadian spouse open work permit, indicating a lure for potential victims. No scripts were extracted, but the presence of external URIs and the overall structure strongly suggest a phishing or scam 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://infrive.ru/uplcv?utm_term=apply+for+spouse+open+work+permit+canada PDF link annotation
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/9e5ae0df92c0c837aa76feaa79cd4511/wejoragiliguvuzu.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/dd6c3f0c5f822a0b999f65c343235081/maxefozisonupitifevu.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16099185eceb8c---84060359507.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/39031785828.pdfIn PDF document text
    • https://svrcontractors.com/wp-content/plugins/super-forms/uploads/php/files/f14a23ec414eede62f0d32629782504c/sijiwoxiliwezikafuvojidiz.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf940f83ce6---52185581956.pdfIn PDF document text
    • https://artbynela.com/uploads/file/83081593728.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e343c95c---jutososojabamazugajeduka.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/421ea00750545c77c81a2cf7c3dfd543/77629477688.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a7381502320---vatidum.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/pamesu.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/sixewuvufuvurafa.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/17346323124.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/ffc0c7a969c6e047dde25461a0f302c1/tafepakenalirasudali.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/7mjkp3tuanckk1g1g6ikb137d6/97230745817.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_off00010e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6B 5548 bytes
SHA-256: b22304401ca1b78b8f1c333614ff05f7bf8367c0285ccd253cf9838aac1132ff
font_01_sfnt_off00012158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12158 10700 bytes
SHA-256: 81188d77049735e7b6069fef7622dfe1672cfa993c033ec306285b28bf66ae05