Malicious PDF — malware analysis report

Static analysis result for SHA-256 36d297a01cc12aaa…

MALICIOUS

PDF

81.3 KB Created: 2021-09-08 09:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 210363891819d6ed9454e52156c2bbfd SHA-1: 84df028979ab66abff6a0ade6fb130b1dc0eaf89 SHA-256: 36d297a01cc12aaaabaa0c1b03c0ea5747c60990deedaedb855fe1221ea615e6
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or exploit vulnerabilities. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://inistor.com/ufiles/files/4568845474.pdf
    • https://wonkingchina.com/d/files/puxezipizezekigisufa.pdf
    • http://htygroup.com/upload/files/43757285215.pdf
    • http://rebeccaosborne.com/uploads/56250265797.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116a7fbc8c53---rukafegoxakisinegesiz.pdf
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/xokabejukovefifixugutube.pdf
    • http://livelyway.com/ckfinder/userfiles/files/48203506250.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f4e89d977d2ce8d61366025214ea4894/kavar.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779f03e567c---jibakipotalopetowuv.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160da59614c356---91508511695.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b0668aaca68---89678872645.pdf
    • https://vayamcs.com/content_files/files/15413554017.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b09f0738ac---54615617650.pdf
    • https://estoniapools.com/contents//files/lafegejunajojuritaxajadex.pdf
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/66832402069.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/b371f5dc559c4f68c9d18892fdd1ef37/tawabun.pdf
    • https://rux-thai.com/ckfinder/userfiles/files/48200779870.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/5d896ad1ec87aecdcbf7810f5ce2c59a/69252513023.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b891352d5b---tatesekugejumamagekose.pdf
    • http://kanalizace-ul.cz/userfiles/file/55697346948.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b6e5617527---13912459840.pdf
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210609_2B5C7E3BE11508EF.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/f018a54a0dca83b64bf5e29df7a9572d/kupaketifeza.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=indice+de+maddrey+hepatitis+alcoholica+pdf
    • 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_off0000d528.bin
1ca0b622cebe836b91b2f39da91850edf2a36bb4921cb896e0d43101fe894abb
pdf-font-stream PDF embedded font (sfnt) at offset 0xD528 10948 bytes
font_01_sfnt_off0000ee53.bin
8f3d5f13254f5e69c88f830b59a8d97842ed23793b846165f3e173f49bf4f34f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE53 18560 bytes
font_02_sfnt_off00011f4f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4F 16792 bytes