Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad57980c404a9396…

MALICIOUS

PDF

100.8 KB Created: 2021-06-26 18:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f4e3f94d059ffbe35a01ee03a417e6b5 SHA-1: 6c805006a5bbfa46814c1a435ba8bf6dfbe9c4c6 SHA-256: ad57980c404a9396d13a9d8d89646861032f4fca8d8a08391cf7b551ba93107f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or exploit kits. No scripts were extracted, but the structure and URL findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

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 http://fritz-fahrlaender.ch/download/96656366803.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/bk47e0rh6fae0mact8c7chvu7l/49578176649.pdf
    • https://rivnerun.club/images/files/madiponitewapotub.pdf
    • http://decaiyun.com/upload/file/210616152046335754xpn5acglbywa.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/75c4524cfae615668bb6c202210437dd/41154303043.pdf
    • http://daeryuhealthcare.com/ckupload/files/53913966655.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/69ddab8d8cf53ce08710b2ddbb4b913f/89608086709.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e5d4078a4---pijazixexalurezopowamusi.pdf
    • https://faprosid.com/file/97023412779.pdf
    • https://bookatowncar.com/userfiles/file/21140055303.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3851b8813---gosimemiteba.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/ff9c3fdaf5f1bd44b59005f1b8801db1/76470118126.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ce645520a---27569005354.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608019e0bd330---powegixaboxaxijobosol.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/djsufosm4thjrj2jnpadvs6tm1/93109932474.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/c423fb4cc3169154d9ff6ba6e7f31b33/95775530971.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/19ddf6309eb4648a6a22def74eb3c10a/kolotoduvukakotewegama.pdf
    • https://cdmsig1.com/ckfinder/userfiles/files/wenepovominibarubi.pdf
    • http://efuegypt.org/userfiles/file/22856544910.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160cf4a04be926---belebizixodep.pdf
    • http://firegallery.ru/img/upload/27295543731.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924e32a695e---tasemelus.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/f3ddc7104ed86ca4c4cde64b6d4a495f/95476596156.pdf
    • http://kaztelcom.kz/ckfinder/userfiles/files/maxekalebidigitaxalide.pdf
    • http://pathtojanna.com/userfiles/files/tufoguve.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/f1cb668569b5a7a673cffd1ff689ae32/gikovuvivaxev.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=states+in+the+northeast
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012707.bin
14647d03cd511a4fc1d26a5fdcd5a6184e2672edd4a8a6861799e3f25291685e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12707 10236 bytes
font_01_sfnt_off00013de5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE5 16792 bytes
font_02_sfnt_off000155f7.bin
8af055395024e93b59986514509208241f4c8a2cb4a963f676380c5997669651
pdf-font-stream PDF embedded font (sfnt) at offset 0x155F7 17692 bytes