Malicious PDF — malware analysis report

Static analysis result for SHA-256 2666d5f4e6d25e96…

MALICIOUS

PDF

81.5 KB Created: 2021-06-25 10:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fff38d9394638ef415c535124b61c040 SHA-1: 0218c6f1405a4b01accbf6dafe2614474e5b271c SHA-256: 2666d5f4e6d25e962230053c237d4b7f088ccc87fa554419faad29df5efa626e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

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 pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution lure. The document body, though heavily obfuscated, contains references to 'service manual' and 'wkhtmltopdf', likely intended to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://queure.ru/uplcv?utm_term=oki+b4100+service+manual
    • http://angeladaniel.eu/uploads/files/17113733905.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/mg62sk9vakf8o9ollfl3le7882/maxudadavubuzitalusiv.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607af51d8295d---bidirerawereloba.pdf
    • http://bettynblue.com/upload/fck_img/20210624/file/lopumonojev.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb3d35b9ec---43407320617.pdf
    • http://edu-family72.ru/content/images/uploads/file/75853797206.pdf
    • http://bulk-supplies.com/userfiles/file/kumugiz.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078924f5007e---bosigaxezuxud.pdf
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/e1161c2113bd62afb0b1e1ab86cd07b3/kumegudaraxidigo.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/bbd67bc44f50518838ad9266c4f69e13/warulelupijeteresiv.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a65cce522fa---viwufamunudevagiweno.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca79141b8a---nipokoz.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a1c22e851---xafowiwiferixe.pdf
    • http://petukmahaaaraj.com/userfiles/file/15113187794.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2471db1abb---74699160730.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/kou7g31pil8pv057ogdjmfm36o/96101991710.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000feb4.bin
4cb6fa9499bc17c6cc15ef66be16a42cd073fb4e329ca7dc09bbf5b707853e14		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB4 5520 bytes
font_01_sfnt_off0001116f.bin
1fa8244e2ffa9cd288c31218d3dd75fc4e5dcd71a688e6c23c6e2a940ee607c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1116F 11688 bytes

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