Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a37e2cb89a72f0…

MALICIOUS

PDF

85.9 KB Created: 2021-09-06 06:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c63c282e429045e150b9cc979fe3e659 SHA-1: 535d8d8ce17286ea8f833c0117b1c44bd8d2037e SHA-256: 81a37e2cb89a72f06197095d1bf7510050d590c712739c1cc44ded10c0d4d57f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to compromised websites, many of which appear to be hosted on disposable domains or utilize formcraft plugins for file uploads, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://nomylo.ru/uplcv?utm_term=primavera+p6+tutorials+pdf PDF link annotation
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608e756e2bf40---fusapijufisegazo.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021060809513373499.pdfIn PDF document text
    • http://aiken7050.com/clients/5/51/510ae66c864a6d23552e02d1b5190e2c/File/wezijunepab.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bd980beef---92981730945.pdfIn PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/vijulafunukon.pdfIn PDF document text
    • http://henca.com/files/details/file/mavififatir.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/kitexemabavipigut.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/40378829459.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080eb9e1b2d2---xuwakanatiruguzafisame.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/acvb6e53tej9elv2k3a8b3bsf9/tajatisijupozanidagobidon.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c904c792b87---rulazixiwimimejaw.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/56c4499cf8eed9340e4002554eacd993/90696830379.pdfIn PDF document text
    • http://wongkungfu.ca/clients/f/f5/f5c316b966f29b3192b3e9e3c5714b3c/File/zagasivid.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/8a715ea4854e3c40001fc66654aa93ca/filamazuzibadufisagonedom.pdfIn PDF document text
    • https://www.espaciocultivarte.com/ckfinder/userfiles/files/92716515959.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/326abccb145f52d74a94ec5410f71cab/buvifizabubin.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/xejakemet.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/6b4a160a97f7c4ad444031bcda603e39/40003255563.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/1b58c9575f38493eb6ff4cff7aec2963/57604654344.pdfIn PDF document text
    • https://taperagi.com/contents//files/99633472352.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/u8ooe2hfftemrtk3p1nq34cipf/60570634379.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/46562711727.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb7e7772a2---93054035683.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001027a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027A 17788 bytes
SHA-256: e03d888570b6319d7ab5099bdd086fb6a1402351c9114247f61c9a103f0e2680
font_02_sfnt_off00013089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13089 10892 bytes
SHA-256: a3de7d83cd2608ba34c632b7ae1ad312b5ad66a5f6aa902288e32314dad77fa0

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