Malicious PDF — malware analysis report

Static analysis result for SHA-256 abb0e2b93c9373c4…

MALICIOUS

PDF

83.9 KB Created: 2021-09-22 11:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ddf91edd0dc8f62eca31fe872366d5b3 SHA-1: a828afbde5717f409ef8e71dfa0770c06bcc29b5 SHA-256: abb0e2b93c9373c406034d2bf444f342e6e30bc8895293eb76c7bd648d742b3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://tribo.kz/userfiles/File/16029826204.pdf In PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/dqj76g0sl8npe1010206nvsusi/2698364840.pdfIn PDF document text
    • http://snsi.jp/image/news_file/36411363697.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/kotigakovek.pdfIn PDF document text
    • http://pinxedien.net/upload/files/dufanivudofuz.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/panolosozara.pdfIn PDF document text
    • http://rem-proekt.com/f/file/xiselalixugito.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/57326291628.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/ramifanovama.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/05jq60fvudeaooiee372bu9h9s/vasomasakitiriletowapol.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/6868122806.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/3576592645.pdfIn PDF document text
    • http://petrduchek.com/files/10775689083.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df069bd384---18602561622.pdfIn PDF document text
    • https://mihalex.by/files/files/25529669161.pdfIn PDF document text
    • http://suaups.net/userfiles/file/15538297190.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/fokobitorobovewid.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/mejelonon.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/21470006725.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8c34267ba---dubulujijesulasomovada.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=hill+climb+download+hackPDF 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_off0000e053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE053 19400 bytes
SHA-256: 07db98b9950573b4ae912d03c09064a99a1fddbb3b9e87079fcc9486066f89cc
font_01_sfnt_off000112f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B10 10444 bytes
SHA-256: 4aa62944f4e2fd461b99c5504ffbdf2072b819b2a8a945bd5885371c399a7f07