Malicious PDF — malware analysis report

Static analysis result for SHA-256 c731805c8ae6b3e1…

MALICIOUS

PDF

87.1 KB Created: 2021-07-02 13:31:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5be9041320033e0ff4a334f3c7ea86f7 SHA-1: 82d59f3404920cb097e1eb5efddb85ca509d8945 SHA-256: c731805c8ae6b3e1997e65517dd84c796015f88b41e3d461a988ba61f00eb5dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning model indicated a high probability of maliciousness. It contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution lure. The presence of embedded URLs and the nature of the heuristics strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://drafthe.ru/uplcv?utm_term=snake+three+letters
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d05a59e4896---14630379391.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/3upamdrmdkdih39s680a9pf7i1/24368001179.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed7aa94360---29158512011.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3c45d00a2---31388949801.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab57bed3e46---36102341120.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/nf0egv7kb67m66t0kl5ri4sf66/sojaromubeduruwirim.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078fdfb0f171---30879180892.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b228c6d29---61949384142.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b61687fdeb---38272952204.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160809e60e92eb---wojujikoluxopivor.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160910ae74f161---90649278014.pdf
    • https://twr1115.net/files/fckeditor/file/72740348334.pdf
    • https://mimpishiodua.com/contents//files/29000176676.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862be79f876---21501478223.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/249bc7b91ec9f5551beeb1b47d468234/vifenuvusijewadagamo.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b73b1f183b8---lozagozina.pdf
    • http://www.knickmeier.net/images/pageimg/file/rupeganej.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607248dc7bfd1---rujito.pdf
    • https://dovolena-jiznicechy.cz/uploads/20323019329.pdf
    • https://conexkarvan.com/cache/fck_files/file/42086632369.pdf
    • http://kibbkw.com/uploads/file/tiwufin.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca6275755de---8559625592.pdf
    • http://ondrejkocar.cz/img/file/nupetimu.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608914987212a---67947504582.pdf
    • 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_off0000eff9.bin
17f4f46220e666ab82049a485bc80b7d426091cafe589130c8cd94fd05432742		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF9 18920 bytes
font_01_sfnt_off00012097.bin
5217153907a4b01ed993b565b7687dfb0c262cec4536ac4675616725a7ecd24a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12097 10160 bytes
font_02_sfnt_off00013742.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13742 16792 bytes

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