Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c0c519bbe09a45…

MALICIOUS

PDF

87.5 KB Created: 2021-06-26 19:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5dfddb4ef7e6ccdbd0f31d91482804a4 SHA-1: b172b156613f074d64f143112f19e54b28697b4e SHA-256: a1c0c519bbe09a4544e10e865da80f1691a18ce2af07796e7a7c6b65dd645d33
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm or redirection strategy. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://sculecuacumulator.ro/app/webroot/files/userfiles/files/zetaxesupupubuneb.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/eu14c5uk6hd7l16h46o65i11q3/69407200772.pdf
    • http://sosonomo.com/ckfinder/userfiles/files/92722007685.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/f4c9c2cf8ae2cb8329ba7179329cff4c/forarepuma.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/2d1iqfual4cu76g49in414id1t/sivafabazef.pdf
    • https://sasalidayanisma.org/uploads/file/zonojaruzive.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fe3765890---puwukako.pdf
    • http://kayamedbursa.com/userfiles/file/tewagogava.pdf
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/becf76b7ded0e228aaef6979f0e86356/11472952737.pdf
    • http://ccforum.kr/uploads/file/1621263119.pdf
    • http://onishi-kyosendo.jp/archive/jodigezegigazaz.pdf
    • http://dinskayarealty.ru/media/file/1144702589.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db15ae5d12---94347067521.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607cac7e80ac0---80207644189.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/61fdc08936ae70e84f1bf35cadea6ca1/figimufezimapi.pdf
    • https://ppuhperspektywa.pl/files/edytor/file/galejajidubanav.pdf
    • http://gdwtechnology.com/fckeditor/file/23899587447.pdf
    • http://ckpak.com/fckeditor/userfiles/file/vujado.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/94f8dbb9f832d6d67843947a0c671e5d/59438735817.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16080b78e319bd---15045368288.pdf
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/dexeguvunivokidafivize.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073a2878803c---23484144388.pdf
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/93497909488.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/jteitvs8qt96er7aibg6lusf61/kesaluderegegufa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+make+slime+with+toothpaste+no+glue
    • 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_off0000f2a5.bin
649fcb4f4eb9b74c8b1545b3390f87c8e8d72cfc5e3b6e9364cdd0323c94ca62
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A5 17056 bytes
font_01_sfnt_off00011f4c.bin
d4af364165043b20496c068296e5ab3e4a0ac6cfbfca39c053ce28abcae62788
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4C 10868 bytes
font_02_sfnt_off00013845.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13845 16792 bytes