Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e3edc13a88e210…

MALICIOUS

PDF

81.9 KB Created: 2021-09-13 08:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 664c049d89c4221a9a6fdf8783ba208f SHA-1: 7721dc8341fc0c0a8ee24d68996803a8f23ba9b1 SHA-256: a2e3edc13a88e210d92c4e694cce62cc882ec517146c999bb968c1a8f6699519
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs pointing to external sites, many of which are hosted on compromised CMS uploads or disposable domains. The presence of these links suggests an intent to redirect users to malicious content, likely for phishing or malware delivery.

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://pixomot.ru/uplcv?utm_term=what+is+the+best+gun+in+warzone+season+3 PDF link annotation
    • https://autonoleggioassereto.com/file/68774615090.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/99696046907.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/lunoxifadovezuvikiwefugur.pdfIn PDF document text
    • https://arendic.cl/files/41882333161.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/42615124229.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/115da88a5ea316e8b24b42315c75e8af/bufusa.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161331fbdeb57b---66555912030.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/55414164335.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/52108392239.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/45960938800.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210913_8F94998A6EAECBBA.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/duzume.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/72891986850.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e15cd906e2---nimin.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/27648868260.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/tebojobezofabigejukolabi.pdfIn PDF document text
    • http://nakakinpump.kr/fckeditor/upload/file/jofet.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161337b8e8ef2c---ximud.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/98905839047.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e86baebc6c---26425862712.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/249972674.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/fotikulipepolenu.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/39d4d4b18a895cdb90f3ffdb69215854/61483202166.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/javima.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_off0000db93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB93 10892 bytes
SHA-256: 9799e07fce6351f93abc65172d96b1fa9fa7ddb910eb0767b1ca13e36fbd1fad
font_01_sfnt_off0000f4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E3 17212 bytes
SHA-256: 150ab56bcc771fa19e15e7239b08ea8508196b8893dad2923dcbeb58f28696e1
font_02_sfnt_off00012170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12170 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1