Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd57a8d655979d2b…

MALICIOUS

PDF

87.8 KB Created: 2021-06-27 18:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8dbd385e9da429d1b2e71b0b939663e7 SHA-1: 3670dad9ee8491a4f6d4e355b5614903c1841c0a SHA-256: fd57a8d655979d2b587754e6fdb18ada6ceb6b0f46bf5bad90901c445f8a4fe3
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites. The ML classifier and ClamAV also identified it as malicious, likely a phishing or trojan delivery mechanism. The file's purpose appears to be to lure users into clicking links that lead to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853c462384c---92588366003.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607766da649e5---17008010072.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/zeviz.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607671d00aa36---pifufaduwixokek.pdf
    • http://liyangah.com/Upload/file/91165487181.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16087911eec1cf---manivenotim.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/077kid2a58jlrvi439ohp9v6m3/filatezisowumul.pdf
    • http://a-kamen.com/userfiles/file/52702803863.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608deb1634beb---gakujafaru.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/e4rpvq0smlep8ja7sq884cafsq/37638399189.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e7f3c0beb---27814714667.pdf
    • https://ivanda-commerce.hr/userfiles/file/74678888219.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/1jo2i3f4hn5vcncd51ud114m80/42132984225.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/7149945e83a8c2b984db76a244f89b3d/65519154344.pdf
    • http://saam.vn/images/content/file/95472480174.pdf
    • http://braciszewska-klimek.pl/fck_files/file/69359809836.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/ce6bffbb6dcbe7adb22d4ae2358a15bc/pituzukijukinufazatoz.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/6076gbe1lcqd9gha057r7hor72/sezaberewuler.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/p08g2lgq7sfvquvsrj9nhgija6/12292545693.pdf
    • http://vizugy.hu/uploads/files/zaxanugawew.pdf
    • http://technocom.pl/editor/file/fitubetutazugogeloti.pdf
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727fffab288---29021474382.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/tldka1no9p05ol3ddh0gs8uumb/12871450540.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/ce4a144ee06e2d03692246831e68194f/mejinuta.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=mother+with+o+negative+blood+type
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f415.bin
0221ec744d5e4f8258518aa734b346a79fb07e5e3dc5a41b9008f2dbc9f41d79		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF415 10900 bytes
font_01_sfnt_off00010cdf.bin
287dc5627cacdf167b220d265d350264f0cfec00f8d58af68164f51b264967c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDF 17300 bytes
font_02_sfnt_off00013a10.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A10 16792 bytes

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