Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2cd6fa7c54a9b3b…

MALICIOUS

PDF

69.8 KB Created: 2021-09-30 10:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f4d1e9fab71a76a335c71dcb14e18f64 SHA-1: cb86d426cdfc46c9c7e73ba5df850baf3da31fed SHA-256: d2cd6fa7c54a9b3b92964ada4dfc6f1665312bd7c438050a82e0de417f50abce
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains a link farm pointing to various compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of multiple external URIs and a link farm indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=spanish+lesson+pdf
    • https://piphoto.tw/uploads/files/202109080136537147.pdf
    • http://alexdisinfestazioni.com/userfiles/files/gixovunivufumidenudel.pdf
    • http://barefoot.pl/userfiles/file/97429857814.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/83bc27068f15c0674e5370e3dc263db7/9605329160.pdf
    • http://gaudi.tw/upload/files/nakaguwijizivosazulos.pdf
    • http://dhleisure.com/ckupload/files/82553196973.pdf
    • https://worldcastlive.com/userfiles/file/26202835289.pdf
    • http://hutbephottaihaiphong24h.com/upload/files/13351071391.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134f98f8b95d---visisowigigaz.pdf
    • http://clainvest.pl/userfiles/file/badurizewop.pdf
    • http://mathcountsoutreach.org/userfiles/file/rosexalop.pdf
    • http://market-oborudovanie.ru/upload/file/12830170178.pdf
    • https://agriplan-rs.com/dados/ckfinder/files/49258538816.pdf
    • http://celeb.huh.hu/UserFiles/File/55061933433.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/37v75jih19rjshfus8mamvgd16/16401620292.pdf
    • http://vitrine-prof.com/files/numolu.pdf
    • https://red-adlay.com/upload/files/bijozodofutu.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148a9ef9fd98---72685282440.pdf
    • https://indolabtek.com/Uploads/userfiles/files/56683708281.pdf
    • https://irrisyst.eu/files/file/nakuxukikofobosuf.pdf
    • http://diegogenna.it/userfiles/files/42699699344.pdf
    • https://stabiactiv.com/userfiles/file/fonefijotefuzovowijod.pdf
    • http://www.blueoak.fr/image/file/nikasol.pdf
    • https://caraudioshop.ro/mm/file/80188258512.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_off0000b26b.bin
03cbd81ea26744e8aca5ba8a6188c3478bbe58939f050fbf5b8146c884cf9559		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB26B 10472 bytes
font_01_sfnt_off0000ca09.bin
799dc99b2ffe747fd425d9dbc62f9fde2c450ab07680dcccc5cb25931fb6ba57		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA09 15528 bytes
font_02_sfnt_off0000f1c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C3 16792 bytes

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