Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9acd252e4ac28f5…

MALICIOUS

PDF

81.0 KB Created: 2021-09-03 02:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cdf21aab772d0a8c72d4ebd3222cb7e7 SHA-1: 8067841dbede27ade80f241ba6fc235d12f713a7 SHA-256: f9acd252e4ac28f5ac78cf314ae6bb34267b5dbd5cb8ef0f58fa6e18e4aebeb7
156 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document's structure and embedded links strongly indicate an attempt to deceive users into visiting potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9dd992936b---82099011483.pdf In PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/nupp3honsds7l0fkrnejpeg3kp/17025478430.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/kiwalonafe.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160828f5859717---13922604461.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/87734276263.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/49ic01rb6c7dh7c6387sqlfg61/26299003799.pdfIn PDF document text
    • http://jiab.net/userData/board/file/44531377348.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/vovunetunavawozuj.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/59695152825.pdfIn PDF document text
    • http://stpatricksreunion.com/clients/84553/File/mewivug.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611017d6b6f93---40639994398.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928c7bbdeee---70312011612.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/fidefajuxeledazolazalozal.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a999a520ef5---55480631425.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/suxurupazopekoxoximower.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/gifelopesanufotux.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a20ddfc18---98005154550.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d9ba1c8af---gaxifabazomi.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/65133933789.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e6a150beac7---49769366307.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/tikufuwulipimoxureder.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610dbc001c57f---57599668521.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/46766741051.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=the+power+of+positive+thinking+pdf+archive.orgPDF 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_off0000d724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD724 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF36 17624 bytes
SHA-256: 3e3f877b6389040be77bf0dc5ab1726c28ac3662e63702b3d1eebc8fc17e8b15
font_02_sfnt_off00011cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB4 11124 bytes
SHA-256: fb88680dd57b4058b60d56024cb187046b661fe10cda9db823544e1bb16bac61