Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff4f2ff7ad0e097…

MALICIOUS

PDF

87.9 KB Created: 2021-06-30 07:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 20bf9c4f33f699595131d30cbe3ca628 SHA-1: 42ae6e123204f42cee96359b7b371a4c33dce2c5 SHA-256: cff4f2ff7ad0e097338a032bddee5487f5b83d5ad9f112de6f9b7b8a8291940f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. No scripts were extracted, but the presence of multiple external URIs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://nmglyxx.com/userfiles/file/6143678915.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f16e48dcc8---52036142696.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daa52a0e116---rajojopofarogukebekaru.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16092b08e642ca---vovirozonitejujopiwupaga.pdf
    • https://ivanamihic.com//files/84480241270.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/e1abdc1e4b3b790f847ce634e389cba9/lipibafalexasofidivupej.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075867ec10dd---12509186558.pdf
    • http://portalpr-b2b.es/img/user///file/_0567730001624538988.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/6cb9f3f3fb706802defca0e6e901e929/96050095424.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a61c4a7286---kodesavojuvoleki.pdf
    • http://afghansolar.com/userfiles/file/98497757735.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/34fb7ddb7ab265695c381da3d01fcbfe/siwupe.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab36746dfd2---46938558079.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/1db37cf29c91893416f58b2c96aecd40/zefovewojedixubaga.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/b3596115bd2938b669f0601d7a0132d4/50131036617.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/6a9b17c8cff06c3b3b00908729bda6ed/rasozomelenuwogikiwan.pdf
    • https://codecs.roimages/file/3341460965.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/b0c8bd31bd5cc822a6b8a2eeac3ed6b7/zabuv.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d4caecc27---89626863917.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/ed68893fbc988e6c008369f019c9dfe8/jepapijipoda.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/t9pdu6j7tl77m3dmf7hghl8u83/41880368220.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/59kq2niiv0ko66h2p80gfop32o/97540575502.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1606c837ee2a6c---10040710634.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=mk11+stage+fatality+stages
    • 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_off0000f31c.bin
e26c1be284663da2f18063fb0946c6703bd159918cd9d56c00acaff93b4cedcb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF31C 18580 bytes
font_01_sfnt_off00012325.bin
0cd2ae0ac52131c37933a203e0428ded045deb5c4c09964030f8e7de928330a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12325 10316 bytes
font_02_sfnt_off00013a9c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A9C 16792 bytes