Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f85426f44b5c445…

MALICIOUS

PDF

88.0 KB Created: 2021-09-05 15:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a5fd88492697bca445594409077349a0 SHA-1: 755720aac361b1980aa226b69e990d31fc4853f0 SHA-256: 9f85426f44b5c445cb8b526b286c291be80df13c8bdd3534e01a175f370e8d35
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the rationale is based on the PDF structure and URL analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/7264cf5ffeb35ab35dc55fe930f05a84/4922815375.pdf In PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d450eb117da1d5e174d68a7a00554c02/81419531054.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210704180523.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/piwusijuzimiwiv.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/31826051754.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/dolab.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/35553681033.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///74804723841.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/ribes.pdfIn PDF document text
    • http://yorktownhs1987.com/clients/57482/File/57159123441.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/25598441607.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/937128f4f672302be4bd5294be7eac14/pigaziwumawazexir.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/aacd649ac6d068a6240271c1e0a69067/13893829430.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/c994d9eca57b2d8596b45cf0ed8c74be/vuxiximadefizitiravexab.pdfIn PDF document text
    • http://polipack.ru/content/file/zenujinoxovaf.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/najiwigiguvizijawolotel.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/ralokilexelemorabu.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c24f787357f---botaselulosemesibefofib.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/bivezowi.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/lewanekazivuwegawukironiv.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/punadazudu.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/josefa.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b86e528eae1---85336129622.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/wunugogapigapusoxulebepo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=definition+total+quality+management+pdfPDF 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://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_off0000f3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F2 10936 bytes
SHA-256: 89b534aa3a304cd544c99cf741295af90379eecbacafa723c66ad604b0fa1e4f
font_01_sfnt_off00010cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D2 17688 bytes
SHA-256: 76ab3f6bc5edb93523d9b8b7226d9be18010d4c2f7f2ba6e2251df302ff6b3ad