Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf52aa89a8c109ff…

MALICIOUS

PDF

93.5 KB Created: 2021-07-04 17:37:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 256d75cf3c5eb1d8404024f9f22e31e8 SHA-1: f8c7fd1c06926e4f1cc1ed8df8e01d77ff11df10 SHA-256: bf52aa89a8c109ff8b4ca5291c1fd6d162d136c9d1bd6a954f01cb09852aafe4
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely to distribute further malicious content or phish for information. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a087c52b039---58516070683.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/0ec53781822e5f14f854fc4b4d339a33/risibejezup.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd1031b091---19673535084.pdf
    • http://frangarcia.eu/upload/file/95645935722.pdf
    • http://pulsarvn.com/media/ftp/file/56951005492.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7abddc4a8---50070492261.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160935aefbd407---85603307369.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/19c0fb8a4017519dbb40dadede6f439b/4246994152.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16076d76dbf44f---87820842719.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160adecf6e2464---83649932832.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4969986db5---nelulelilu.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/6f487d8d9b74bb30b5ddb6414ef3964e/jafufonavewis.pdf
    • https://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/75f561b466ca5f656892985361df114a/ninomasufugeleridoj.pdf
    • https://alarrabnews.com/images/content/content/file/jilogem.pdf
    • http://fly.no1-yes.com/userfiles/file/gegenazajisisekiso.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609410dee8cd3---97978723106.pdf
    • http://anhuicrew.com/upload_fck/file/2021-5-10/20210510021048621642.pdf
    • http://www.deco-interieure.com/userfiles/file/bigafovezenomokobixukak.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d149a91fff---77702340074.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa2cce699c---koxavirawiriferexezi.pdf
    • http://luatsutiengtrung.com/app/webroot/uploads/files/katumikonalunowolemad.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/22bca660dd8a0b1fc344bf6c46cc40c9/61380013867.pdf
    • http://aliceinformaticasrl.com/user/pages/bozaxafitivega.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767d2129984---16417212296.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=screen+recorder+for+windows+7+ultimate
    • 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_off00010a23.bin
845784b60c0322c2e54e6dad6247930b82dbda8195de15dd94eb90d8946fbe72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A23 17160 bytes
font_01_sfnt_off000136c2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136C2 16792 bytes
font_02_sfnt_off00014ed9.bin
be829cc76163fd057599a2b7816542f818939a6463987872fb8634552d1a4575		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14ED9 10948 bytes

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