Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f49fe2c0ff9e817…

MALICIOUS

PDF

95.7 KB Created: 2021-08-09 07:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 04681d6877f19c357a24559e76f24469 SHA-1: ca90979ae0b4ddfb77a679c80abc624747ebc373 SHA-256: 4f49fe2c0ff9e817edb18e3385c1a4f152b476ad2877b62e8cb08c4f8d2ee94d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. It contains numerous links to external PDF files hosted on various domains, suggesting a link farm designed to distribute malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs users to open a password-protected archive, a common technique to bypass security filters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://laborke.ru/uplcv?utm_term=arris+tg862+manual+espa%C3%B1ol PDF link annotation
    • https://casentinoshopping.it/file/kupes.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e176ad096---62883947271.pdfIn PDF document text
    • http://askort.pl/Upload/file/65154110753.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608831f51ebe4---47771501009.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cf126f0566f---49611700555.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/91579147273.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/fofovijugulabakeg.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/33746091590.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c30a32b2c38---7429808832.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/55053171125.pdfIn PDF document text
    • http://shelton1961.com/clients/35589/File/78432572913.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160721633245f8---zuzesiloxogusomelawelapep.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec6ac56900---73342168932.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/7a34a8b74b4e5d3af7c3ca3293a1b632/kesaxebadatenopal.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/xorukir.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a5d1cb03a09---dixafupowaponako.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/eb80fe75a228cfa2522429dea9fb002b/gewuvekozezonerobuxe.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/33b796ba2419068547f4b144b999cdfe/gosisubimobo.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2ba20e7b1---xeruraradesuxomabenevumi.pdfIn PDF document text
    • http://strap.sk/uploads/files/11815126146.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/20776140451.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210809024658.pdfIn PDF document text
    • http://djpress.pl/Image/files/84481420312.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/50235698527.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_off00010e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E17 18340 bytes
SHA-256: 8cb7fde7fb99ee1ec47e1b63d0ef266a6319eeeb63d5642077fc5708e8763e42
font_01_sfnt_off00013ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA5 11380 bytes
SHA-256: fc316c42b8859ccf1d10e2f4ca0550e8ca22568b2b8242f51ad1d23239c4b480
font_02_sfnt_off0001574e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1574E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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