Malicious PDF — malware analysis report

Static analysis result for SHA-256 265237243ca9c101…

MALICIOUS

PDF

68.3 KB Created: 2021-09-24 20:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 666f9530f7045ca35e493fcb918f8894 SHA-1: 5afef7efee7f40494576eae43f1fb0f3a5a43c79 SHA-256: 265237243ca9c101340af43138b33ab4f02f45ca6fb1e090c4965b2eaf236d9f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains a link farm pointing to compromised CMS upload storage, suggesting an attempt to host malicious content. The document body is heavily obfuscated, but the presence of external URIs and the overall structure indicate a likely attempt to redirect the user to a malicious site or download a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://insights3.com/wp-content/plugins/super-forms/uploads/php/files/b1d4a950e1bee3a2b2385a64db7fb921/bufumikarebabud.pdf
    • http://axiomestates.com/userfiles/file/71663204537.pdf
    • http://madmojo.com/fckupload/file/70258621148.pdf
    • https://elesud.it/img_pagine/file/mugigorudutexesevi.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b38dd7853c---95545739824.pdf
    • http://kocavietnam.com/upload/files/wakiwezetowere.pdf
    • http://prime42.ru/userfiles/files/121441585.pdf
    • http://www.sosonomo.com/ckfinder/userfiles/files/13245589833.pdf
    • https://naves.cz/res/file/wafugebaxi.pdf
    • http://es-manzokudou.com/yamituki-n/uploads/files/3199769537.pdf
    • https://alibaba-cave.com/userfiles/file/35361031084.pdf
    • http://cx-gl.hu/images/files/zoviputenozuruvopivasu.pdf
    • http://mayinluatudong.com/uploads/userfiles/file/13505043515.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/439616afc7a91f3452b63f4e0813d783/49307182939.pdf
    • https://bruceautoservice.com/files/file/teditosajebiwivozuginege.pdf
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/tusovalexekudisokefex.pdf
    • https://sanaspinler.net/calisma2/files/uploads/35189634681.pdf
    • http://enjoyisagenix.com/ckfinder/userfiles/files/21097220908.pdf
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/gulipemigorozonen.pdf
    • http://studiotecnicomaglio.it/userfiles/files/fudodej.pdf
    • http://z500.si/files/pokudom.pdf
    • http://marktoby.com/akram/know_news/admin/userfiles/file/95814471339.pdf
    • http://www.jindatunnel.com/up_files/file/82739948663.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=avakin+life+android+1
    • 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_off0000afcc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCC 16792 bytes
font_01_sfnt_off0000c7e3.bin
6baeef64372959b54e55db6c33ad631e8586c0676e94b0934eba383006ed48aa
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E3 10272 bytes
font_02_sfnt_off0000df1d.bin
73154b48951d4e07c1e4c40317eba214f9da3ec5d1af3bcfee8a5c4f8d8671bb
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1D 14560 bytes