Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91c63b06735d101…

MALICIOUS

PDF

83.2 KB Created: 2021-09-06 00:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d93c7bbd18187055b327c50ade1e9f28 SHA-1: 692e7090a7dc468dc644989c556f582aabb5c567 SHA-256: d91c63b06735d101a5055252979e6e7396faef52ac6bdb596a4642ffdbb2a85c
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised CMS uploads and disposable hosting domains, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. No scripts were extracted, but the structure and URL analysis strongly suggest a phishing or malware distribution attempt.

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 http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338fa809386---mosafinifodaw.pdf In PDF document text
    • https://samtee.com/admin/images/file/jotawofipudonemepi.pdfIn PDF document text
    • http://tomlitkom.ru/ckfinder/userfiles/files/gajazef.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87e5633b61---22071384662.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/jckp3q5n2eel2ej3np540b935u/55971398763.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/tatepikuzegoka.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/15419436402.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/221980a970d90b43ee6a8eff820774dc/fidavuzun.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/lazuwixi.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/60575041252.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/dafulenojudo.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/lonozutorebudurekepok.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609b658531d61---46191508309.pdfIn PDF document text
    • http://cochemical.com/upload/files/toxovezejazemadetelazega.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/9kit98qjh4r7c9ecilk1tbt6r3/fisifiravufakekopega.pdfIn PDF document text
    • http://irths.com/upload_files/files/32564730363.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/wafez.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/vevanopizodavaxorop.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/jadazabudevixapi.pdfIn PDF document text
    • http://wami.cc/data/files/gomumoxabexexad.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/48750863453.pdfIn PDF document text
    • http://vanhoadautu.vn/static/uploads/editor/files/butekeridedukeradi.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/kazokajigobobedovezif.pdfIn PDF document text
    • http://kalikraft.com/images/file/kazamosoturuwop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=coordinate+plane+worksheets+pictures+freePDF 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_off0000df69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77B 17540 bytes
SHA-256: d33c5a62f5fc13872ccfb7628975a03c144c489736670041ceb1a3b64b877928
font_02_sfnt_off000124f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F3 11028 bytes
SHA-256: 83e815739e57b928dc593e03f3772c0d8353a28b08959df9611b86c95ef07bfc

Open this report in the interactive analyzer, or submit your own file for analysis.