Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cdcda165983acfc…

MALICIOUS

PDF

72.3 KB Created: 2021-07-01 22:37:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 23bdb0092f30495720c331de433e946f SHA-1: 693e26832a04c15fafb6c6a91b2604f45100dd3f SHA-256: 5cdcda165983acfc660953e8e145a5d4b20460a21971ffd360ae01f7ef4867fb
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to redirect users to malicious content or phishing pages. The presence of multiple links on compromised CMS uploads suggests a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/2n0olrh8o3sh2vldcn64cjbp42/20523033147.pdf
    • http://footstepfloor.com/upfiles/files/33892855237.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/460ab89f075123dd17c79c9adc7e5661/raruximejufuzo.pdf
    • http://carrozzeriardue.it/userfiles/files/73987596100.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/dda960efa213051216e5a8f0272e8456/12252667930.pdf
    • https://villadorottya.hu/uploads/frontend/files/51937613123.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/6fbb570c29cafad4b8a85f550bc35af9/75506028626.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609509ddef522---91093626473.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab43d5469e---rudim.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/dd54f7acfddcc491e6ed990088ba596f/38959055163.pdf
    • https://implant-drill.com/userfiles/file/81303294472.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b368e935e23---worezafob.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccffeebc387---23289543057.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e71790fbc---vojimupufixapovipafa.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/0e69faf2c1c1bde1eee968cb8264c055/36169747405.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608624ed6babe---wimixugasoladu.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/9dbf5d641245df3554814274bd3d0cc3/xukuserulamabonazotutudi.pdf
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160780c7a8e2b4---31645155355.pdf
    • http://botosani.ro/img/uploads/file/50700532917.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160954c798681e.pdf
    • http://hurtowniagrafit.pl/userfiles/file/webofoje.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16081345cf2658---52018991184.pdf
    • https://atamergranit.com/userfiles/file/jimejanoxef.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+most+popular+women
    • 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_off0000b99d.bin
beca59a55c7367bccb6eaebbacfeeed55649cacb92e2ce0f055718badd77ec2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB99D 10576 bytes
font_01_sfnt_off0000d1ac.bin
9bbe7e4fa0dd798c3cb49b0dffe70d216a4da899650a22766b944ed71e8ec850		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AC 15936 bytes
font_02_sfnt_off0000faa3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA3 16792 bytes

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