Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6e08c1382d14c9d…

MALICIOUS

PDF

76.3 KB Created: 2021-08-20 04:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 414a10bbc82e5c1cb7a3356c56d994cc SHA-1: f5a7356950e239f0db5373c60cbe3db0468b36ad SHA-256: e6e08c1382d14c9dbb50075efe881eb460e5fd985ada4aa6877527e68265d272
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm. These links are likely intended to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nomylo.ru/uplcv?utm_term=mcgraw+hill+connect+accounting+answers+chapter+15 PDF link annotation
    • http://andlupa.com/userfiles/file/sinaxo.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/morigisomofaterakuga.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/fojan.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/pologivon.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/78246268210.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/52635453830.pdfIn PDF document text
    • https://isosklo.cz./uploads/kixumezano.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/6ce0a31d31371e2dffb1d2fd52c09361/62832467421.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/56063435432.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7181f2704---62554687868.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/posojixadofenajenuv.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/60557285906.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a445e830ced---vifutedofunidimumutuv.pdfIn PDF document text
    • http://cuatudongbinhduong.net/uploads/files/vixegexipogesumozip.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/taxonumese.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/40859381128.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160827611730d7---denopojadefajepod.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/68555379309.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084eba784b1a---fupagopowawuvunujoperozol.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/9854507047.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6242934bcb---komewubej.pdfIn PDF document text
    • http://nccutrackandfieldnation.com/clients/2/2c/2cea5a7e730406ee40dfbbde6098010c/File/poviroxilazonosetulazezi.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d40ca1ae4659c5fe11b88f6f7064a05f/pelukikedonopixuv.pdfIn PDF document text
    • http://srlamn.com/clients/0/00/00e84243199fd86ca7c15d66a0237eb0/File/20028378219.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF61 16064 bytes
SHA-256: 5d2a1eaec1a210f84bcd56207b3d951de3e7bbfedcad74259b7085e2847df620
font_02_sfnt_off000108e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E1 11020 bytes
SHA-256: 636df06f8cafce249195e5f12cc9e08eecd19fdd6d22e29a4f0fc7121b85fa52

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