Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cbd421e5f0b2244…

MALICIOUS

PDF

84.9 KB Created: 2021-06-30 06:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a1eab37189f099b0ab1d5b162ee9c02 SHA-1: a83fa904b16423d85494d29a04d42928a1e5083c SHA-256: 8cbd421e5f0b22447d7173705777ba9ac9692df8962e63a9237722fcc5dadc8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other hosting locations. These links likely lead to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/kpuv72bjfbp667u5gm6qrlbtrj/40998776791.pdf
    • http://logiccpacma.com/ckfinder/userfiles/files/73708476784.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/neeaerh70hfpq50tu7rdpkm115/wobukakin.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/8pt9j3f5onkjp99ldaf16kuuej/67934114261.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/8bab3b169eba24d7a8766858d5a92116/12431735975.pdf
    • https://etimes.mn/uploads/files/dugodijurifowi.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/97c6c5eadb59979db57875a73f602f7b/kivevemezakulimorewa.pdf
    • https://aashianarealty.com/file/norutimet.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9e226a371---51719137024.pdf
    • http://e-skala.pl/userfiles/file/84309928434.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff6d10f09a---tirarajegeguxazekava.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ddf52dcf1---pomoxejedefip.pdf
    • http://meteosputnik.ru/userfiles/file/rofifazodawevupa.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f8c6047de---xamukezetifanetiroz.pdf
    • https://equator-maritime.com/userfiles/file/30730714102.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/98f2t0oe0l140i7p16udknk2a7/rudime.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609141f43b73a---zoborezitobomuwejopevexe.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb0a355a62---tupetavokadowo.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d6cdbb059af---timaba.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c471ee63488---gimelepazasexenabiwaxusos.pdf
    • http://huiking.cn/uploads/file/160414359872.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609471be7bd71---14653974562.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/a597054233f37fba2c80b74654643a82/nakiruzodasoxijagumaja.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/5scqsd0g88ehiv98b473nc0qe1/16389136309.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a321b8ec015---pejuro.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=yanni+until+the+last+moment+piano+sheet+music
    • 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_off0000e954.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE954 16792 bytes
font_01_sfnt_off0001016b.bin
b653bc6ebf81fa32be995f84f04e9349e7476d922a83b55aa69e207e04250454		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1016B 10624 bytes
font_02_sfnt_off00011986.bin
9d2397775c1a3d9f965e29105acc126932b03c94f48cd2f175d0e86d9909e522		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11986 16904 bytes

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