Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7fc74ed69d29438…

MALICIOUS

PDF

84.5 KB Created: 2021-08-31 23:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ed875e673161cdac021f7c1ca996330e SHA-1: e5d5f4dacf17dd5c1fdfbb10a4190965ff71a836 SHA-256: e7fc74ed69d294381cc4a5d84315dd94d9fa79088ee4e64b0ddd3ec7aa1c083f
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document's purpose is to redirect users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://stark-tools.ru/images/uploaded/24019838753.pdf In PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/bemexenobe.pdfIn PDF document text
    • http://recviem.ru/img/upload/widek.pdfIn PDF document text
    • http://douzonebnf.com/upload/file///nepawirudizevunomajiw.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160798e96a9cf2---39797412520.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e37330b4a31---26916642883.pdfIn PDF document text
    • http://weddingdiy.cc/uploadfiles/files/20210624_235520_7157.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/52698969634.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zegageponol.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/aho9pi4ksqk6b5creb3vqrs1m0/difilozabij.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/rusetoxoruxaxegutotexipu.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/19699266745.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/fomufijokigemakuwidetave.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fuxazumexijobotanifif.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0a5b4d221---tagabubarob.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/silizefovedotil.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/jiuk1bt3d30ep42u5glqiigh97/nusovovorubag.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/rizutudesufowu.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/733d2459ba3cc4536d87f47ddec0c659/jibuwawezutidel.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/sevodud.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b319249b827---sisalatadasajamudawax.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/wigab.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cc322ce26---60588160179.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/1746889403.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/sijusogunawakuwozuxos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=java+all+in+one+for+dummies+pdf+downloadPDF 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_off0000e142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE142 18760 bytes
SHA-256: 03e161b556ed83411b41e52846bb6c45c18337e6e378786e58b9d0dba2184c10
font_01_sfnt_off0001119d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B4 10804 bytes
SHA-256: 33163d428e28da1c5005d1d8e291b64e0ab1b9d2b730834b8471615850cb0dec