Malicious PDF — malware analysis report

Static analysis result for SHA-256 967fd77e4a52155a…

MALICIOUS

PDF

96.0 KB Created: 2021-07-17 19:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 403b8655123b34e3efa4cfac3252b47b SHA-1: 1d51de5502d1e6fef34d054f42484e052cad3b31 SHA-256: 967fd77e4a52155ad3fd219fdaae44a706b3d702952fcb24661e879140a66f4b
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating it functions as a link farm to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The file's structure and URL patterns are consistent with a spearphishing attachment used to lure victims to compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160931c6130a91---sasok.pdf In PDF document text
    • http://uhy-th.com/image/upload/files/99245144895.pdfIn PDF document text
    • http://naucseto.cz/storage/duzikipimo.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/47147173484.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d324209458---4387400998.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///57582819240.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/67940619271.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/7b9718da28159d2f5705072b0d888e49/3078886497.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/a144a0910b6cc5625d988728b969fc9e/66580109918.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/29427933731.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/17725548277.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/4isqcosjop1spv9ajnl4q3f2nt/95966320450.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b479960da5e---fogolafuxukifi.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16095e3957b9bb---diwafetunoraroj.pdfIn PDF document text
    • http://ceroki.com/image/files/lonujefekinulasikawe.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/83ec9s5ae30b99ei4bdon63njf/74889001781.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83719237b3---39481088908.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d20a43bc61add83e7d4ac34fd63916ef/jorumamup.pdfIn PDF document text
    • http://ellerbeefamilyreunion.com/clients/874543/File/38856427446.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ad854cd3d---xorajinewaxi.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070dfdf6f0d7---nesemebapalitugosil.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/rogexekazapimoper.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/cd10527773a9f58acd7f8b6d9fa9546e/4813826966.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094de521e7da---puvejanitojuxos.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/f53ece141c77db2c3e222d710574ba39/doporopowumavami.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=semblance+of+lifePDF link annotation
    • 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_off00011527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11527 17692 bytes
SHA-256: 346ed1fb1f2cacdf675624696dcde97badb57204f8755c01b9de4a2b0d4b8227
font_01_sfnt_off00014347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14347 10344 bytes
SHA-256: 190c0f02f1473c857c0c3929639ad67ac0daaa2a428559748a380f01cd1f1e2e
font_02_sfnt_off00015a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1