Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f82a310596cb71…

MALICIOUS

PDF

87.2 KB Created: 2021-06-26 16:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 122bd3f800a3315ceeac4ff489bda110 SHA-1: c313c8f8c65a6dd4cf1df3f51bcde667f537233d SHA-256: 81f82a310596cb7137c6a3f28ac7ff823ba56cee0cf3f6c88a2cb71098d5cbbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c521b48dade---26586965735.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e3ed61f96---dazoguvewopidolekizuke.pdf
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lilaferokelapamud.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c77fac60676---nexezadenuwudebafivi.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/90e875f0bc2bdd2b964289474a42fee5/fekaw.pdf
    • http://netinflux.net/userfiles/file/wajujibosesifotedazoz.pdf
    • http://bycongroup.com/UserFiles/file/58200794089.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/65ade8b0529d8c2a014f8fe9ec53cf3d/34308348693.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/tul2n1u6q47gla0o7iu1q9b274/49159702771.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/daiahh52769q0rgjov63svga63/34465538141.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4a20b7651---58377050197.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/a085a787b8425bbcb55b92d383e749c5/10954782875.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af961a6ed85---7540217298.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/c27a7a29e49dbf79ac4b78e384d9fd94/45866720412.pdf
    • http://aihyang.com/userfiles/file/zivizijuximep.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/474ee5b1fc5dfe3664bf68cfa95078b2/murexepabo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+many+calories+in+a+bottle+of+chardonnay
    • 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_off0000eefb.bin
48861724008461da13d32f04f43347991c5e3787b6ad41ce7ac38cc01e5150dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFB 18156 bytes
font_01_sfnt_off00011e3e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3E 16792 bytes
font_02_sfnt_off00013655.bin
3882b86f35091a62367118fd3718598e0400ece6688d939aaa287af4202312e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13655 11072 bytes

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