Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c44cb43bdadea38…

MALICIOUS

PDF

85.5 KB Created: 2021-07-03 06:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5eac87eed72a754d20b0551e07706963 SHA-1: ca1670534b660c3edac94a2201591b3cd71f9bb2 SHA-256: 5c44cb43bdadea381608317ee227632277db5a57647d1d6bf9a4e6b85a25aaa5
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, serving PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting and compromised CMS uploads suggests a tactic to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a84ce53fa3---tizelidigatuguvida.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3965d8dd7---kabogopezo.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/1b08de3ebc86143daca09c1ad19147e7/pefuluwe.pdf
    • http://limoride.net/gallery/file/lirojofizuzuzigaveruk.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/ac6abbb73619ca6a631f94fdba4e1b7a/94244147163.pdf
    • https://castilloexterior.net/ckfinder/userfiles/files/20989558845.pdf
    • http://cadelupo.it/userfiles/files/vefumuzijexuwemasat.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/5e15c32113d0321c7976cd407abdddf1/75519858134.pdf
    • http://xpressup.com/userfiles/file/xijexi.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609d200e38e43---3308928555.pdf
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/80253201063.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/d4fa00ad703473a4a4f8207b0f9b8872/nikotudixelegasiso.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/irpnr6pjloo7e5g35m91jb2f3g/vevapokedananarukinudem.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/eb0b007950021b09d1d4bfb5ef6196a2/nunuzoxukadupibokaboraz.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/5f0b6a1016649ba9bb8e06cd0cd12061/63790744286.pdf
    • http://palyavalaszto.hu/teszt/upload/file/95699999196.pdf
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a51b5773f---nozozi.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16088fb4d1f7fb---29473960177.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a613dd6e216---sevud.pdf
    • https://siahotel.com/userfiles/files/63249175235.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/b670572138f7855f6bf6894afd7c6dda/vavexepugaluboli.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/1e3acabf39f7012f607415e06bae14fb/2619642789.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c886cbc7422---zigizonisuwapa.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/4da82b35338c6769b47e4b43d22512ce/52704286667.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=drugs+for+dry+mouth
    • 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_off0000eccf.bin
159a277c600c3b41433be3c24061c09bbf0127dce18f491fb9a9ad0a5fbb0740
pdf-font-stream PDF embedded font (sfnt) at offset 0xECCF 17028 bytes
font_01_sfnt_off0001190f.bin
d1c32cbe3ac51d5b8cd4a353eb91356690f2ae2df167359334156ad32e018d32
pdf-font-stream PDF embedded font (sfnt) at offset 0x1190F 10480 bytes
font_02_sfnt_off000130b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130B1 16792 bytes