Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd1e3de8a646bb05…

MALICIOUS

PDF

83.4 KB Created: 2021-08-26 13:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3f4ec6c2b567eb88241b18cea8f6e354 SHA-1: bdcf1cfa2bfd331e028bb196cc540e08a02b5dad SHA-256: cd1e3de8a646bb05c15c0679f1f1ca7b007c83f78df219e7781e950929729544
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farms indicates an attempt to lure victims to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://philabc.ru/uplcv?utm_term=thiamine+tablets+side+effects PDF link annotation
    • http://etcad.net/np/upfile/file/jabakiduzifikuxazo.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/78638509993.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/rileduporom.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77cac91af5---zegira.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/70090374752.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/32675750117.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/furusiratawodewuxameso.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/65451611211.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bebcdce7e45---92906228372.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/db6814ef98fac47c2bc8039472e4d968/pujigodumojuwasizo.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/9daf7c3b9e18486ae1a6454cb6072568/zafojogotonajom.pdfIn PDF document text
    • http://metallpress.ru/files/peposodaterivifofofijesok.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/01dc88c9300d31e4da18d6583bc306ce/tifetowo.pdfIn PDF document text
    • http://goreskyreunion.com/clients/b/ba/ba087d28c24afe6c5bc45fa062332e47/File/vozufaw.pdfIn PDF document text
    • https://air-separation-supplier.com/d/files/1347602225.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c457ad6badc---navagemivodoj.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/a5c3080aea37075d2a83e9f3a97daa87/mikulatuziraxu.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/d6795508d5bb85022ad31409a4b2cc60/gegomukafumifakedanepis.pdfIn PDF document text
    • https://hirurgija.me//files/96401382550.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/p8tt8ii95jlndui5l4d6j5iqp5/zogawakuk.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/sajuzuwiku.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/20529145826.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/trjt9set7ufr82i81aifasbg47/vekukakukexofufomatutu.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/vegogonapif.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_off0000e473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE473 10624 bytes
SHA-256: 90a60c54ce39ceddf069f80c1c2773cf2a24effbc0ec78bded5830f4c7e64482
font_01_sfnt_off0000fc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11498 16544 bytes
SHA-256: 2051b688ef95769f4fec1ffab03807f4e5330ba2e1f26ea22ab782b58ad4b6ad

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