Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba7f46ef3f839577…

MALICIOUS

PDF

85.6 KB Created: 2021-09-07 20:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 800a1dd14879aff8be0b66d2805c92bc SHA-1: e72c8c8bba273981a8082a320cf49bb67d1d5720 SHA-256: ba7f46ef3f839577b0b6b8eddcbb852e584958541b2095dd91235228404d791a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://dichvuketoansg.com/luutru/files/45740487134.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab56f4f1fde---tojizamusufofigu.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/mcf1klmljtjb79q2c0rn9nkc57/vavugoniwoni.pdf
    • https://franchisefarm.franchiseharbor.com/files/files/42619917350.pdf
    • http://tsnpharma.com/upload/files/72032440756.pdf
    • https://wisestudentz.com/userfiles/file/vetufanaruxatopoker.pdf
    • http://ampletrekking.com/userfiles/file/26349378434.pdf
    • http://zhxndl.com/uploadfiles/files/puxezuxepuw.pdf
    • http://nemeckystrakac.sk/editor_uploads/files/77416759090.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6d3d11c04---nazupo.pdf
    • http://tourister.kr/userfiles/file/70977798852.pdf
    • http://antasboru.com/guvennet/resimlerfiles/27449432932.pdf
    • https://officialbacknumber.org/editor_up/21099534722.pdf
    • https://turismopontevedra.com/ckfinder/userfiles/files/nodozu.pdf
    • https://mariapolis.net/ckfinder/userfiles/files/noxisosuzisebovew.pdf
    • http://zwickerfoto.hu/_user/file/gasubuzuv.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/s0019ccvv5ptfvsd2i62be00u1/89021637984.pdf
    • http://sntaviator.ru/ckfinder/userfiles/files/82871093824.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/681b3ffc200ef1a5cb34d531d8803dc2/20993544379.pdf
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c922ebe5b8a---jaredoxegosilixar.pdf
    • https://alianzatours.com/imagenes/file/lipasufizixiwujovi.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca982c3d99---kiligunozalotafufo.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/qvmhu8mdb0hu3lup716fvht25r/96484705268.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=juntar+arquivos+jpg+em+pdf+online
    • 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_off0000e79a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE79A 16792 bytes
font_01_sfnt_off0000ffb1.bin
e6db098eb8b325284d666534d039661c633e447f5c6bf7d7d91b8e3d3d20de46
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB1 11272 bytes
font_02_sfnt_off000119a1.bin
b82961c894612134c3c238de458096f15adf2bcc16f30b488ad0d0a8718b7429
pdf-font-stream PDF embedded font (sfnt) at offset 0x119A1 17740 bytes