Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4ee3165befef08a…

MALICIOUS

PDF

86.8 KB Created: 2021-08-05 17:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 97658256694f7e31185bed61194a5e4e SHA-1: fa3cd9cd37771e1a2b2474834636ee7b328470ab SHA-256: e4ee3165befef08a2cdce23a26b20c604a5ad553b5a2d2d27c7f9c0e463f2c73
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely contains malicious content. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised WordPress sites. The primary purpose appears to be directing users to external sites, potentially for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=2006+sportster+1200+service+manual+pdf PDF link annotation
    • http://promocode.lu/userfiles/files/tolidakefunajivawujejikat.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/pegud.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/81395279489.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/b16f91743e8a1e990fa710c52c5ac164/1136737998.pdfIn PDF document text
    • http://lhjmfamily.com/clients/5/5d/5d8645f74963a96e1aea25f3b610eff6/File/96555954595.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/tuvafir.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa7eb50ded---nevolupugebuwodawa.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/tugimo.pdfIn PDF document text
    • http://bellsazshihtzu.com/clients/878694/File/xomapijenivudazedexajadar.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/79784028604.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/4o5mntc7l24e7fcp6pjeob14cb/rojesowuviwobunebodu.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606efaf9bfacf---sejonakifabesixibi.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c511ece43ca---14722462663.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/c4200e0fb6ec7f1f721a896b7d56f048/tipazoxofol.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/disigukimupal.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/13943785659.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/d326338561ef08e3289c6ff3bc3c02e5/rorexosuwumari.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/32714849741.pdfIn PDF document text
    • https://miet.hu/kepek/defegavewavawomazuzoliwo.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160741acfdf629---lutaromibugajogawiga.pdfIn PDF document text
    • http://canadanur.com/resimler/files/gebejutolafafelunukutaka.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d599191496---lerefapag.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_off0000eb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB96 11312 bytes
SHA-256: c45ab1f7a7d9a2f3855b588db1292e45611d71858c8d522f900540a693b74871
font_01_sfnt_off0001063f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063F 17724 bytes
SHA-256: 221a0012abcabd8472e615e2ad1c0aa05b006db539e749c7f9a342c4bff49f61
font_02_sfnt_off00013514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13514 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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