Malicious PDF — malware analysis report

Static analysis result for SHA-256 5958b63248d0bbec…

MALICIOUS

PDF

76.8 KB Created: 2021-09-09 13:12:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b51f9aa5516187e014e9865c5ed8323a SHA-1: 9700f6c37cad73cc3330337b0c93fa4777562352 SHA-256: 5958b63248d0bbeca8a6277cd762553fb0c8f91b847f266cc5316115903ec259
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, designed to lure users into downloading potentially malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The primary attack vector appears to be a link farm disguised as a download portal for pirated software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://nomylo.ru/uplcv?utm_term=grand+theft+auto+vice+city+stories+download+for+android+ppsspp PDF link annotation
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16132f4bd90678---jowumudapisage.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/50871307402.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/8846196603.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613829371a2ea---83102925769.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210905001435441017ouwc6.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/jasaxazepuzebizefikuk.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f54749b19f---bepejapuj.pdfIn PDF document text
    • http://silver1979.com/upload/file/88125892570.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/62474554587.pdfIn PDF document text
    • http://seto.cz/uploads/kanomew.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/14106072101.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210909050520.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161393d1b21298---62483376374.pdfIn PDF document text
    • http://parfumland.sk/upl/40584450993.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/bobixaji.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/nikif.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/finil.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/gutetufuzuxon.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/f1b794f00554a104c92d5b427f5edbc3/60949732199.pdfIn PDF document text
    • https://hoalavender.net/upload/files/44531559839.pdfIn PDF document text
    • http://a-pluset.com/userfiles/68233123928.pdfIn PDF document text
    • https://micsys.in/userfiles/file/vilipexur.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_off0000c7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F7 16784 bytes
SHA-256: 0f5999eb3d1499439f71ff938a3248549c3ea56e4718e2631c01613a944fabbf
font_01_sfnt_off0000f311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF311 11120 bytes
SHA-256: a3cdbc5871a976a8e2ee713565ee98cfe485e70044a9d47f10a941406934994e
font_02_sfnt_off00010d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1