Malicious PDF — malware analysis report

Static analysis result for SHA-256 372221185b78fe0b…

MALICIOUS

PDF

83.2 KB Created: 2021-09-17 11:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b4059ae3fc6c4447141ebbeee92b921e SHA-1: 526c8ee467b55d55294e9eb836d3f4bfa0abdf4b SHA-256: 372221185b78fe0be3d6dac7970775ec73b2fae41e81ca7e9c69a18a37431f97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms or disposable domains. The embedded URLs and the overall structure suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/zuvijigiwojuniwamanow.pdf In PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/18119852693.pdfIn PDF document text
    • http://ipai-bg.eu/img/file/13534789148.pdfIn PDF document text
    • http://horvathortho.hu/tmp/99885613364.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/wizixekafuwa.pdfIn PDF document text
    • https://windscrm.net/files/file/nidej.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/tusopofugekuzonuta.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/14446403813.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/10848327465.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614387508942f---45530858755.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/16770436055.pdfIn PDF document text
    • https://mklaassen.nl/images/file/xufuror.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/60014539138.pdfIn PDF document text
    • https://makenie.com/upload/files/544045080.pdfIn PDF document text
    • http://skomi.ru/img/files/file/jevujuduw.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/76608926857.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/gajizoxinesogus.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/0tn5oh619rfhhiqbgih0u9oidu/nanusup.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/7d82fe7d6f4a5c1cc82c7bd02752704e/21008607135.pdfIn PDF document text
    • http://kes.org/upload/editor/files/fevodomasirofivur.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/80876590405.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/16619232137.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16141e23d10617---61965315946.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/5304871431.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=vidmate+app+downloading+2020PDF link annotation
    • 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_off0000e13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13E 10764 bytes
SHA-256: 7b239e43545ce563fe9f2abd30cd433ddfe9ffffa0d822a4b1b128e92553962c
font_01_sfnt_off0000f9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E5 17488 bytes
SHA-256: 3a313733aec70349c145219d0f6ee8a020a7fa7838ba023c6e13ad5d276fb368