Malicious PDF — malware analysis report

Static analysis result for SHA-256 7149c3c2b3460772…

MALICIOUS

PDF

93.6 KB Created: 2021-09-21 06:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3d8089011ff86aa53136db692817e464 SHA-1: 0af83357119b475af4c15e20482d6ff1e1488373 SHA-256: 7149c3c2b34607723cc6b852873cb6e8fcbf9b4c729ba121c85903fe8baca840
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this. No scripts were extracted, but the overall structure points to a lure document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://queure.ru/uplcv?utm_term=mad+men+pilot+script+pdf PDF link annotation
    • https://sealand-pptc.com/userfiles/file/81869504422.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/dosinira.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/26625318963.pdfIn PDF document text
    • https://andana.us/files/files/60920671232.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/2729505147.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/zezekaketaregepajerid.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/d72a0971a061cadbb19e9812c982d9e6/13423978390.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/94631505159.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/xozovaleferarikafozare.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614306e54eb62---34685126402.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/82944897717.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/dudedafazevudaxixodas.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210904235100_cxbnc6.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/37753994037.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/25213732021.pdfIn PDF document text
    • https://csodamalom.hu/files/files/nogubigalida.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/sukikibagefivufenuwefat.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/vogixigifumexanani.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/88618605594.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fab76c7b6b---73478707024.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/70249311540.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/942877576.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140e50e8fb9e---wuxexogojenuw.pdfIn PDF document text
    • http://bollnas.boj.se/uploads/userfiles/files/mekaxogugokarez.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_off000107fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001200d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200D 18492 bytes
SHA-256: fb7a1032995fc657dcdd3b965c26df58b50dd4c27a7c55ce1df8cfe56cb5bb8f
font_02_sfnt_off00015021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15021 10772 bytes
SHA-256: 8eb0d4ab4218049c70bfb7c2991bc1bb1461ddd5313916900604e9386eea6a44

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