Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2cc92bc6ab7f58a…

MALICIOUS

PDF

74.8 KB Created: 2021-09-02 12:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d0b12a625a72e5b8fd6454096f1e4f47 SHA-1: 2855c2e4b6442553a503f99ae190d2e807c8b348 SHA-256: d2cc92bc6ab7f58a22458dac7972c2a28968ff413a84ddbac9f979fb1a4426d2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to compromised WordPress sites, suggesting it functions as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URLs confirm a pattern of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://drafthe.ru/uplcv?utm_term=enamorada+del+ceo+1+pdf PDF link annotation
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/mkh7s5idntru0goaa3fjjvj2vv/tolipifizexozokote.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/44137855420.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/ef2ef9337a151bb4a9916806d21c5548/34396588027.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/96946302792.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/fifinitobagutokoku.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/dukaxopezaxaru.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084beeca0b93---ferumanaxepol.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/pomozomimotepajav.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/66806139196.pdfIn PDF document text
    • https://btegypt.com/file/zodokaninoxoposu.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/1b243fec1769293d1fe8a4430f8cc489/41706034221.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/vukujovisavemizugu.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///gixomodumeludotigate.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/nizumisejaxural.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/towovapureriv.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/85422832595.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/41423752102.pdfIn PDF document text
    • https://steammining.com/userfiles/file/ledetubulifilakalunira.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/8b8cc4cbdd5f023027a64a7114eca719/dekiginumigas.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/vutanol.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/h9cicv3fk4qgttkdnpmacad0ai/42575912223.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/1566ffb8928c2522464c2431f7d4afae/jefuzijepiwekexowekago.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_off0000c103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC103 18088 bytes
SHA-256: f1113a3ce77626bd3262638801c165f1c2966265837332577c3f91119f774357
font_01_sfnt_off0000ee8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A4 10456 bytes
SHA-256: 256a23d43f89fb530ddcdb19ed75cc5cf6de005ea495815d31f7d5f7c73ad11e