Malicious PDF — malware analysis report

Static analysis result for SHA-256 e96b834f97d39b50…

MALICIOUS

PDF

89.5 KB Created: 2021-07-31 11:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c2bd816a24401982bfca112fbcb6f2b SHA-1: 82b2465b30fbfe7210d3259caa9a28bfe86a88d9 SHA-256: e96b834f97d39b504e4e928b584f22f4201ab031d6862dfc0f9b2283633ea360
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking readable content to infer a specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://philabc.ru/uplcv?utm_term=descargar+libro+satanas+gratis+pdf+padre+rico+padre+pobre
    • https://livre-art.com/ckfinder/userfiles/files/93941236282.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/abb3ba571b73ee3e66884e0a204ea5c3/67851712971.pdf
    • https://tipresentoio.it/images/file/pemese.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac05e44823b---pelomivov.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/sufebom4rhpngh5qic9404qkcc/91536898980.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/nimakozukuv.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/29dd01fc341e22f31493d77dd6dfabd9/dexigegeruwovuwokekonifat.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a2df3d570---44298088057.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f72446ec8f---99802937453.pdf
    • http://heritagecarletonplace.com/clients/c/c2/c23aa4fb54f25340752d20cfcff880b2/File/fifab.pdf
    • http://drironcat.com/images/file/42543752359.pdf
    • http://onishi-kyosendo.jp/archive/mawokowusufifiwijap.pdf
    • http://10glazsikeyrosa.ru/file/wumojedagudalesilezekepo.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/3vn8u2oqf63e0cps3h680oui2p/tipozadoneditewazemunoded.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efa7321e60---gorilo.pdf
    • http://pchs1967.com/clients/b/b3/b38b0c0be7ceca4b309dcb684d78a7c5/File/zelubalisemis.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee8d4742f7c---25959726001.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/639c322e560e9d9e171efc7cc749d7bc/zokijituzagubimotojut.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/98d2d0ee7704e8ed357dad8454456ced/potubibarobal.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9c8f2c31e---26690259665.pdf
    • http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/dosepujodipomikomone.pdf
    • http://grodgolf.com/clients/f/fd/fd83fa7079552abb47853a85229f74c1/File/96725412489.pdf
    • https://zenmobile.in/jaipriyart/uploads/files/28896275188.pdf
    • https://mediaget.com/userfiles/files/mewuwuzufukilos.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_off0000f47a.bin
a7c10d722aed1ec635dc6dcd4a3c32fd246f8db7daa6e860f2d7339a72090109
pdf-font-stream PDF embedded font (sfnt) at offset 0xF47A 10936 bytes
font_01_sfnt_off00010d82.bin
f8081777d0659789bf85fa769c2958f3037a5030f66a7b6610cc2d03bd575c2e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D82 18992 bytes
font_02_sfnt_off00013d81.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D81 16792 bytes