Malicious PDF — malware analysis report

Static analysis result for SHA-256 03969894beb9650f…

MALICIOUS

PDF

87.6 KB Created: 2021-07-25 19:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ab480ff8c9e83a557f74058ae261cd1a SHA-1: e1bfb121d0b94ab510216d9add9a6b218b92ecfd SHA-256: 03969894beb9650fd33025d7dc002b97355dc626867d42229863b173f2d1d0f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The `utm_term` parameter in some URLs indicates a potential SEO manipulation or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/0bdt1tjaicfp9um2fjvm6s364i/10925887043.pdf In PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/518086d716ec68f175e490d950eb8c5b/mezuvamudubeloti.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/pepezojotapigemodi.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6013e24c47---tojivemanatebilufovuvaxu.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/30160979842.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/zofetubapugovovenud.pdfIn PDF document text
    • http://moon-villa123.com/CKEdit/upload/files/pizekajukexoragaj.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ef9bb101d---lozefinejisul.pdfIn PDF document text
    • http://placc.info/up_image/wagetopidizajatok.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/vefob.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/n3n8lkbfsjtias23i8eqb1p1s3/gebunox.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e8d3885ff---pinudiripuwegetapu.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/mofuluzatadutopaxiraruson.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/43060626721.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e47aeeb03eb---pamapimunaloniwumekixega.pdfIn PDF document text
    • http://fabtur.ru/upload/files/66071040063.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a6915ab5a---24407573929.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd19656a24---mategamadoje.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/15850559156.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/c975188de23c6c79b52ae312071f3ce8/98443190627.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/7521888582.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef92d0baac---wilufaxomurigesejedube.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/malekevuxawidolota.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4c0142457---nojaxisaxanimimulugox.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/64238115723.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=learn+how+to+do+cashier+checkPDF 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_off0000f034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF034 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10846 17452 bytes
SHA-256: 79e6371a25bb17ed8cd9950d9274d9717d468e34be2da252a02d4b9e165082ab
font_02_sfnt_off00013611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13611 10556 bytes
SHA-256: 23463cd6f0144669a66e20b19c59dd5b488740ba95c3eb589efd0866c4668709