Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5e3fee3471cfdd8…

MALICIOUS

PDF

81.1 KB Created: 2021-06-28 04:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb1e6d51e20bbabde83cc65331ca224f SHA-1: 843c3cf1bb674695c8da29eaddb33be25334e40b SHA-256: b5e3fee3471cfdd89474a27c4bb31313ebe7e09bf5e078f059df23e6492609d5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS upload storage, suggesting it's used to redirect users to malicious sites. The presence of numerous unknown URLs further supports its role as a distribution vector for potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ac6fc6d03---97800389300.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964b0a2a31e---98589972314.pdf
    • http://pusancard.com/userData/board/file/bisarexinevade.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/6fea1476cfa306aa473f659e77215a08/pomotadek.pdf
    • http://luisacortesearchitetto.it/userfiles/files/82515978281.pdf
    • http://xn--om2b25zm6igqb.com/ckupload/files/15981353980.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5f136c322---rasitobizevujimu.pdf
    • http://handbook.hu/upload/page/file/32948892151.pdf
    • http://vonkoenigsmund.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca49b2a47e---xafekuwu.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/730f57f06ce5ff213d557b065d49c230/zigariporowubamagiwabikax.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/96d8ae2f5d0ccb3992b1e44e81101ace/mubezusafexaxedebex.pdf
    • http://cloverdiamond.com/file/belof.pdf
    • http://engroupe.ca/aym_image/files/xatadoxevikinez.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e11bec5788---48232566368.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/ob4f7ecu321onu8v66vh3s5o30/noxepe.pdf
    • https://simondaulte.com/ckfinder/userfiles/files/wikigavoputiwupulep.pdf
    • https://miaousland.fr/ckfinder/userfiles/files/18484032671.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/2774d032adce43ee9191cac106aaebac/47108120160.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcff066aea---pewenarawa.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160721f45cead0---6948916315.pdf
    • https://ludifrance.fr/userfiles/file/vofufo.pdf
    • http://matsonconstruction.net/userfiles/file/kafixilonagomuwareper.pdf
    • http://petraifevronii.ru/ckfinder/userfiles/files/65863070152.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=lil+peep+one+more+chance
    • 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_off0000dcbf.bin
45df9fc4f94acefc450ea4390bfe58f7e533ebf8d39086d66499f2d040cae864
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBF 16912 bytes
font_01_sfnt_off0001083d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1083D 16792 bytes
font_02_sfnt_off00012054.bin
b00930bfb553b4ae16675cd234c6127a2796ed3ad197f42b6b599454a9c28bb7
pdf-font-stream PDF embedded font (sfnt) at offset 0x12054 10332 bytes