Malicious PDF — malware analysis report

Static analysis result for SHA-256 92cf2dd92a960043…

MALICIOUS

PDF

82.5 KB Created: 2021-09-22 23:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 05961d88daa20cc1de85068c602ffed9 SHA-1: 68312316ce02d9ea534b83ced870c4650522c510 SHA-256: 92cf2dd92a960043beeb6a61ccf4a70367c6ad397bb873838e5f25d187ac51c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://crysiq.ru/uplcv?utm_term=best+pdf+software+for+pc PDF link annotation
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613953840765f---wutuzironivevezigoxuzaza.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/30482554731.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/xomogoviviwepekolowo.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/96860079135.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/99b636536d9d03105c0d2b19b2f92467/43603062813.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/69026619843.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614252acb27eb---97723204806.pdfIn PDF document text
    • https://megashina24.ru/files/files/xefuwexakajijubuwivodu.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/26332125628.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/46461530699.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/88824867903.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/sokodarikeginunodep.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/jokasudotopafuborovabor.pdfIn PDF document text
    • http://szwygs.com/upload/4023296860.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/gutapuromevupasafizo.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe21c86266---xajuxi.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/lelonimupuxipe.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210902115423.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/72529741507.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/jizivofibi.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/f605b754273784ca73ff5990d334cda7/28397047138.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/b1d2805285f9bca5b4dcdd2c7d9c1d18/zilegolisopopez.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/dokejedufaguromezefivew.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/2979e11f7173e3817560628cd8194973/86891473081.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/65850273256.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210922_062745_2462.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B6 16852 bytes
SHA-256: 9bb1f1ec2df0116ab5a9f2df1a193a0615b73fbaf0ef3310c76a6549260cd7ec
font_01_sfnt_off00010c4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4E 10512 bytes
SHA-256: d1eb138ca9221834655306c36b1c84f6c5bc2d1defe7dda9e11c2330d6b4eb72
font_02_sfnt_off00012480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12480 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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