Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf0d2388e18056e7…

MALICIOUS

PDF

81.6 KB Created: 2021-06-09 06:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 9b70b33520e4a716626bde8cdc9e76a6 SHA-1: 9265c8cab32d13be536f8397ee83acb8481071a4 SHA-256: cf0d2388e18056e73aca61ed66e9d9e44a4d78db1f83aa03663164b51a682dcc
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a phishing or link farm attack. The embedded content, though heavily obfuscated, likely serves to redirect users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://garglob.ru/uplcv?utm_term=watch+ninjago+season+2 PDF link annotation
    • https://ferado.vn/userfiles/file/bifivevunupepukoxikezim.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6800ebc74---6330814770.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/448977d0b834c1e0ac60473b48b8b7d0/16408510833.pdfIn PDF document text
    • http://palami.by/images/file/21865049699.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/nijetunusirolojanaxoxemi.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2819c044e---bopefekomizasij.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/sesesur.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a839ad37fca---sijememapepodoj.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/zodimuxexojemelij.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/16638018426.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a340e2864a3---botigevilegumoguvuza.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/dp52abmo2nl4ark901tokqtvh2/bigatanus.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/kiwarewenivokamabalanip.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/uef736jpogvag63aun71q898o3/79307700772.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16075db27f00da---72804000228.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/d0708024d18fec48fd05e2b2617d185d/zopizijaja.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4e492a0e9---bilunaxegodanofemivarav.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_off00010256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10256 5152 bytes
SHA-256: 6121b94bdb01483d25feae2605a827de771163b0138bc86538483b511e6e4ac3
font_01_sfnt_off000113f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F9 11004 bytes
SHA-256: 5e7b2f7f64aaa030049a98314e7def24468701170867dda3dce47018cff87fd6