Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6403ab5851603a3…

MALICIOUS

PDF

139.4 KB Created: 2021-06-28 22:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b5e6c4ea9749ffad902472747182b974 SHA-1: 45c96e0f298601e0e83a9d33110816b2f0defd29 SHA-256: b6403ab5851603a3ce34476dc13ae7b0b3989530407be93ae0b14897219914f7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The file's structure as a link farm suggests it's designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9369

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 http://adabaskimerkezi.com/upload/file/75239746932.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d466154ab3e---zazijewijofazukesodaf.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecd56c54aa---bodewenubowomasarovomimel.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/57l0i8pef4jrjm0kot9vn976l3/7914679927.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160859ce38758e---wiregizuwivokav.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbc47e3c4a---jukevapaziz.pdf
    • http://omonetach.pl/foto/ilustracje/file/49114673944.pdf
    • http://seabeachthailand.com/UserFiles/file/wupilomufamanigujex.pdf
    • https://agermag.ro/mm/file/lazugatijukolidojil.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160732f0dada3b---53461145281.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d41b14502---nonekakeludaxosol.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/89eec786f14687bde61d516789c9b5e3/fizusedovolanomuxajafapes.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/40168655127.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/a752bacbdc5dd6955717b5aeb8c2c3ae/porasig.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3d3024ed2---971525926.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/1803e06d9c5c28a3db0044930407d592/zepokagivoju.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/75eeb7cc0479115a6651fb771386bce0/xowadikorim.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16093964dda11e---gitemowis.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba406b9d07---timol.pdf
    • https://zegabilisim.com/calisma2/files/uploads/52050553858.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160764047a2d5a---10692863897.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d20a8b8fcf---86627704733.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608ce71f3ce74---75659473407.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a0732e1d2---ravatagibafuxanulas.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b57d992767b---53887899054.pdf
    • http://seanmore.com/userData/board/file/livas.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=integration+by+parts+fraction
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a179.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A179 16792 bytes
font_01_sfnt_off0001b990.bin
06afe42bbf91e24780e0428211f24e205811dead06a4bb2752aa284ff069abfb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B990 10812 bytes
font_02_sfnt_off0001d274.bin
919f1bc367624d721b2fb31ab12125a2b73dd255637d65187c7543b9c3013291		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D274 16224 bytes
font_03_sfnt_off0001e848.bin
c3c8c80f110ec94136156a7e3b13186b07ca70ee32806cdfa69db392cefaf9e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E848 20476 bytes

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