Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c2aecd539f823d2…

MALICIOUS

PDF

76.1 KB Created: 2021-05-28 10:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e04ebc74a0f18d92382695e85998ac66 SHA-1: 56ed58d4ecb903e4335f49c1230f84ad989fb106 SHA-256: 6c2aecd539f823d225bec2d77965717b45d23e46cf40cfb55edcebbb9e53fe0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links, many of which point to external websites that host further PDF files, suggesting a link farm or redirection scheme. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classifier flagging indicates malicious intent. The embedded content, though heavily obfuscated, appears to be related to software downloads, likely a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://chcial.ru/uplcv?utm_term=minecraft+free+download+apk+v1.16.100
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c36d75d52e616bacad216c4a35415a4f/71537833471.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a0059a397---97909831504.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a85be2a70f3---totulovajumosu.pdf
    • http://stroisvias.ru/userfiles/file/18676166172.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/da361555bd04a06b8176e80130b11778/tevage.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750670d8b33---25927106870.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949ee4a180f---69273700005.pdf
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/zunog.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609504de5d453---77030457090.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/bo1555568ioun8f2lv6v3r0fn5/kukekinisomugomedub.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7e80ed659---jofekexodoriwitu.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16073e6b8eb133---40576432723.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a06470931c---45487940695.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a36dda1b3cd---dijaxaposemi.pdf
    • http://auto-spec.ca/fck/file/662925910.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/em7gsc7ao4gr9ghl0ok4q2oar4/95231861528.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_off0000e9c2.bin
2c55a74f545bb204847a0a263646e9cb70d90d56e81a03a1bcb3e5c4b970961e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C2 5572 bytes
font_01_sfnt_off0000fcf4.bin
ca94f280bf88c00b2cc3ba7249fc2c79d2c61674e54f47cf404a65ad9f7a543c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF4 11396 bytes

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