Malicious PDF — malware analysis report

Static analysis result for SHA-256 a02ee6a2d7048746…

MALICIOUS

PDF

87.5 KB Created: 2021-07-08 05:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f33f368d7c4e609a9b7178a8994d723 SHA-1: 57535ca93ffa4cfb90dcbd6a3f9e427edb68ea97 SHA-256: a02ee6a2d7048746c7533da50ab980c8771ca63a7ac88456f33041d72a53131e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is a common method for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=weather+software+free+download+for+windows+7
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/fd701ce39d2e3e5ad6abd0e3ea5fa8e4/vowirotonifedusuwodub.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16098499b203cc---24995222747.pdf
    • http://fitviewer.biz/files/file/muvasekenuzorinojez.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6db0db5a59---wubejaki.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/qofvlsj0k9ja4mk69s4eu2cbs2/35921857920.pdf
    • http://docando.es/js/ckfinder/userfiles/files/sakabixiwerotedatizazux.pdf
    • http://championsview.net/userimages/11652147060.pdf
    • https://coil.hk/upload/files/sebadizopudijonu.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/fdb00dd5407dbbbde093f2ee3a8f7ec1/4716226406.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d185359fc14---gogadubasilorevu.pdf
    • http://opakowania-loga.pl/zdjecia/fotki/file/xujagagezapazi.pdf
    • http://kondicionery-ivanteevka.ru/upload_picture/file/nugikiselagag.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/rjgdsrg72m6an58qts2boi79ub/latopu.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c53b977aaa---sixefafutemi.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/6n4g91k6ndfnct6umcnsbos1j2/leboganurusuluwisiju.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a889e6bd608---22703091030.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1b24c50a3---28716589149.pdf
    • http://dzbnf.com/upload/file///32001691060.pdf
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/dapibokoxojix.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/ii1l6lmec2r533bsrhr1tu44m3/lajoxegutaxu.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160925ae415d83---duvewajujet.pdf
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/sibuwetavipajufameganer.pdf
    • http://scheiden-maassluis.nl/uploads//file/getunuxuxekixumuteki.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_off0000f5bc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BC 16792 bytes
font_01_sfnt_off00010dce.bin
62b82d4be6fe740665191deda620cad7fd421b447fe26f8b2fd07d55d1566dc1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCE 16432 bytes
font_02_sfnt_off00013851.bin
c4051e2d775070fcac8f7a9828437d793f302089cae3772d8dc82d597cf748b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x13851 10580 bytes