Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdedee59b527cb57…

MALICIOUS

PDF

94.0 KB Created: 2021-06-25 14:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4c40480f6807a6881ccee3609e26480f SHA-1: 7a24911a75653988c4baf4238b6e5f1dd116c620 SHA-256: bdedee59b527cb5773e8660207ab1c0c96fd07854b4f7214cccb94dc816f099f
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be redirecting users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://wastran.ru/uplcv?utm_term=a+concise+introduction+to+logic+11th+edition+exercise+answers
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/29b70e0377d82cb461edecfd194a0801/26603026123.pdf
    • http://shethof.ch/cgi-bin/dynamisch/file/28532188768.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3ce51a60c---rojaxasupew.pdf
    • http://ambvet-trefontane.eu/userfiles/files/bikonan.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5237c416b---15908475827.pdf
    • http://php-lounge.de/userfiles/file/62804519211.pdf
    • http://www.ecostroyservis.ru/File/13565794008.pdf
    • http://thetuckerfamilyreunion.com/clients/67950/File/97596754027.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce633712d0---leguxewaxuxurakofezor.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/b9eced8a910ec03661add2306320ce4d/25586633315.pdf
    • http://dienmaythanglong.org/uploads/files/74547848113.pdf
    • http://snotlicker.com/clients/10243/File/19461759126.pdf
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/balelozitar.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16081d778b8227---64824123204.pdf
    • http://ankurgroups.com/userfiles/file/melitasunaxofobekukutevu.pdf
    • http://hgbs.de/userfiles/file/84851187493.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B5 16792 bytes
font_01_sfnt_off00010fc7.bin
aa203219f71eb6afa7b181b9491ff2fa838b9a9229fef412fea9e965d70b33dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC7 16892 bytes
font_02_sfnt_off00013bd0.bin
3f739bfdd62841c824c8782d7415149a53846c974b4fe05938d87e7f87c4bb23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD0 10972 bytes
font_03_sfnt_off00015527.bin
a79c9caf7d9fe7d7e6557dd08284a48a0650ee9668136fadcfdab94fba17ddb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15527 16084 bytes

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