Malicious PDF — malware analysis report

Static analysis result for SHA-256 36e36b6e94eb7e54…

MALICIOUS

PDF

86.1 KB Created: 2021-09-13 13:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c7d26e1b7b6f6da9ace3af36c5f47752 SHA-1: 544c57dfb8322bc088568a70d8a658a04b2f17ab SHA-256: 36e36b6e94eb7e54417d511537443ea13ec1533d03d252dc9f76ead7c1d3b7aa
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting it's part of a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous URLs, many hosted on potentially compromised sites, strongly indicates a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1e6faaf02---47100154696.pdf In PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/13848057797.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/5u6veakd9dujuoh8d62628uhvd/97097918226.pdfIn PDF document text
    • http://guowangcable.com/d/files/mexop.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/jametejomo.pdfIn PDF document text
    • http://gibisch.info/files/files/25932927230.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/gusuduv.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///15589974019.pdfIn PDF document text
    • http://topstec.com/d/files/riletiminirudofikezaxuzul.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/16890237903.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/79530233352.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/woreju.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de1f086b91---mimefonuxezodo.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/23866258244.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/sujitagapazi.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/41260307474.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/02/file/kosopikonixana.pdfIn PDF document text
    • http://ingore.cn/upload/files/15489550762.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/4ri0uspdhkiimohp1gbgjkkn43/1268184463.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/79441732589.pdfIn PDF document text
    • http://www.moyekolodin.com/files/daperesepuvar.pdfIn PDF document text
    • http://newcityhk.com/userfiles/93763868475.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=top+10+tower+defense+androidPDF 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_off0000ed70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10582 17004 bytes
SHA-256: 7a12f36db100e16946d4c9fc4b41acea61338abc6528e2d7a02ac8bf3de8abbe
font_02_sfnt_off000131e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E1 10668 bytes
SHA-256: ca526b16e785b22d1828b0d832d0ae616028fe3fc5d50434bd2827837a57cb0b