Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f0d66875828aa64…

MALICIOUS

PDF

80.2 KB Created: 2021-09-17 21:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 549c6ed2a57e2134d9b21195e094cb5a SHA-1: d6912be37583ecdab750c2cd730ad1427d0070e0 SHA-256: 7f0d66875828aa641adb442536657aa6d2e6968bf42519e4aeb066b0a1909452
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the document is part of a link farm pointing to compromised websites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/7e0c56c0624ef1b6b85afb70b2771114/damadatezelupevoxujugexa.pdf In PDF document text
    • https://nevisnews.com/userfiles/42074471270.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/tatef.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/ketugupebajusowe.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/7ff9f7b2996b56abd2e75a78c8110eac/xukejavumuji.pdfIn PDF document text
    • http://rayanchem.com/d/files/dabiboxapidesutasimotixi.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/k98udcfapfl87u0nr8hhlo2p98/1527347507.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/71271672232.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/74543396042.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/87ee8db2f902695118241a8b2feed225/xagewezekipomesivogufa.pdfIn PDF document text
    • http://pk.mo/userfiles/file/terike.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/63467269280.pdfIn PDF document text
    • http://emaaravm.net/upload/files/42722280751.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/jazudalakusunikowuf.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/kobev.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/31491354199.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/90124111818.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16141fa8a01c2f---51980271815.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/50815869762.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/21688601723.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/6692547670.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/46900354435.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/44115557983.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/44585784134.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=aladdin+online+moviePDF 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_off0000d8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E2 17272 bytes
SHA-256: bdfad8c0ec7a38fdf91f3815d453cd6cbf3e73aba6bcb3e221c0e6675c3147fb
font_01_sfnt_off00010500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10500 10092 bytes
SHA-256: bfddf80b57fbe9deee252582056ae9c44cfd41ff2ed6e55992b3821e291aa657
font_02_sfnt_off00011b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1