Malicious PDF — malware analysis report

Static analysis result for SHA-256 76d4ec0bcb8409e1…

MALICIOUS

PDF

74.1 KB Created: 2021-06-27 04:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 346516ece53c6bb4246fe91398022b8e SHA-1: 7491e75b210c5cfc07d8ffda3b1b706f285cfbb0 SHA-256: 76d4ec0bcb8409e1460dde4995b15e83c1c69d56c1cd2ea8467d5e67c8c14641
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing to multiple domains, many of which are hosted on compromised or disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous external URIs and link farm heuristics supports this assessment.

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 http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ad03ql841b3j7ph8agmphea4s1/73010094721.pdf
    • https://khangle.vn/uploads/images/files/60573933831.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/6010cc6968d074b8a57552168804655f/limizimimuvo.pdf
    • http://svsteinfurth.de/radsportfiles/file/jomepomakutepebavox.pdf
    • http://jeremypourstarlight.com/clients/5/53/539822683240d2210db56c0084569a8b/File/67759603293.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/4020641379.pdf
    • https://zulapin.com/calisma2/files/uploads/vezapixumuwutesujetam.pdf
    • http://guoyangmoju.com/userfiles/files/fetoxafadedenowevaki.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/3lq3l246el5hk7kmulcctt7f68/nadukufigewifemiw.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/pc528nqe48ratedge6oe17jbkf/tidaxaragexegajelijatov.pdf
    • http://flagrant-desir.com/userfiles/file/wogupalazoli.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/50c9c74602a27f0eeec2291adccd8ef9/sakudot.pdf
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/b8fddf6ad352b06b376993c2c27686e2/35290393597.pdf
    • https://prtl.pl/userfiles/file/94206808317.pdf
    • http://feast.to/upd_file/93564469123.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bac88a4c620---20049621517.pdf
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/30085557788.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c940da9a14c---fomorugosopokejem.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5e653788c---98837208949.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/0e946947e82e95ebe8f401d2fadf3118/fukamuwemupuzeda.pdf
    • http://stinpo.com/ckfinder/userfiles/files/76294061079.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/cbe3f41b68a46e9a588669c268695894/tipetijatulubum.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=positive+carbylamine+test
    • 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_off0000be87.bin
47fb99272043c0bb422cc78c910e7e804082496d40d989043574e1abb86d895d
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE87 16940 bytes
font_01_sfnt_off0000eab6.bin
d735d69a9d91c8bcb9c275e22741f2af785d73b2d519b2f86a0b348508076d37
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB6 10712 bytes
font_02_sfnt_off00010366.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10366 16792 bytes