Malicious PDF — malware analysis report

Static analysis result for SHA-256 922b07ad346f8662…

MALICIOUS

PDF

81.6 KB Created: 2021-09-13 04:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9a520a7a64904f77d0f7493d354992b0 SHA-1: 99b6a4989736f2858b84822311f54817a9613408 SHA-256: 922b07ad346f8662aeb67c63f0d42f87950ad8ef9acb833de02294e2c3c5f018
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://dkmmotor.com/files/userfiles/file/zoxoduranajof.pdf In PDF document text
    • http://unionnutritech.com/upload/files/37417157953.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/jopenafutusafaxozuxagud.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/sotovigamusavobebigopati.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/31501080138.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161342247445ef---97035907794.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/4c5cf99e7cbf7f5abb6c0204e396b357/rarevedizopisumariranezu.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16130c5a661902---mijedapamewe.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2326f280a---49164913958.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/superisedar.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613e731a92041---18506869652.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/61209349847.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/pawupogivelamujepolunafa.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/6570366570.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/kowawaxa.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8c238ac8d---75084711333.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/63847184638.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/nolipujuzasaponuzozi.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/34539969368.pdfIn PDF document text
    • http://muszempilla.com/files/file/mozawevapewinapiwak.pdfIn PDF document text
    • https://zhansq.cn/upload/file/34555890466.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161371dfce35d6---58339460803.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/pewesebetedejupaf.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/51711613476.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/93378691812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=audio+note+taking+app+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_off0000dd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6D 16568 bytes
SHA-256: bce51a1e06c18dfe4da61dad2ea6b3278109d4c350d65bc2a634006dc0f0586f
font_01_sfnt_off00010855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10855 10524 bytes
SHA-256: 49fa32c1b6465cd0e0b566ac1b03c6a1bc2cc555f9b817175c3f1b942cb86e74
font_02_sfnt_off00012038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12038 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1