Malicious PDF — malware analysis report

Static analysis result for SHA-256 53855a0cf69ad1d2…

MALICIOUS

PDF

93.8 KB Created: 2021-06-27 17:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 70130f3bd207b39c4a2fd7afca925db9 SHA-1: 1384cda3fd3451c280cac93c43b8a4da00572d6c SHA-256: 53855a0cf69ad1d2d719d877791c48ce92becfba66c3293e1750ec47745c361e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://queure.ru/uplcv?utm_term=you+have+been+using+snmp+on+your+network+for+monitoring+and+management
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/gvpmf3lrtabd67udru06bq2l7e/sesenavakobovotavig.pdf
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/5eff838f2be974b4e2d32f61a07a2c0c/suwemun.pdf
    • http://ascensionchina.com/userfiles/file/33049869147.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b2e82a3e3dd9339046815d7c60cfad8e/2272180084.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/7cd69adbd317dc4d42c20156790a8552/99788513015.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/3d533bad6226815655ebd604c8f80659/65657630748.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/01a7d0369d1ae2a4053a16495d385452/bepik.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160913b56718fa---88718587830.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/uks2q2gojhhroc9621tpoqt4pu/telesuvili.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bab2727b97a---badoxizawepojisepujox.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/qiiinf06mag3k4shvu4oec4t6o/muzukuwis.pdf
    • https://goodluckfishing.com/ckfinder/userfiles/files/nogava.pdf
    • http://casaatlantida.com/userfiles/file///sifizidu.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072c20b49297---67800094642.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f5fc5173a---noterunusuxuletepuzo.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4pls66u48vlcsa85vg25ed1dl5/jigazatoridupup.pdf
    • http://sladkiy-ostrov.ru/userfiles/files/42573166212.pdf
    • http://swaminarayangm.org/userfiles/file/74093677029.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/mmvm6v79ce4k4toangp2mhmfds/gigur.pdf
    • http://goneviaggi.com/themes/userfiles//files/64591325381.pdf
    • http://kururlaub-ungarn.de/bilder/files/11968525098.pdf
    • http://yesilderecine.com/admin/editor_resim/file/13433375731.pdf
    • http://highlandcougars83.com/clients/2/26/268573c5102cd00412bac87cee9346ec/File/54938231633.pdf
    • http://beergolfers.com/blog/images/file/mabarewitafamo.pdf
    • http://grodgolf.com/clients/f/fd/fd83fa7079552abb47853a85229f74c1/File/xagatofigirojo.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_off00010a55.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A55 16792 bytes
font_01_sfnt_off0001226c.bin
a15bfd273240e58c4f95e351216a550a7f85d0ba7256db4f961413217ce559ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x1226C 11480 bytes
font_02_sfnt_off00013d0f.bin
7b5f4f44b31a687e815628601b8ae50bbbd95a6e2146fd0340003eaf478bf543
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D0F 16940 bytes