Malicious PDF — malware analysis report

Static analysis result for SHA-256 778787df0b7df185…

MALICIOUS

PDF

82.4 KB Created: 2021-09-01 20:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1bc2238927e29a69eeb52631fdfe3fc1 SHA-1: 109a7c96068edcbb0269c43aeb8e682e37819514 SHA-256: 778787df0b7df18532df1da73901997a5389f3ecc213221c7776c49852264728
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many hosted on compromised CMS upload directories, suggesting a link farm designed to host malicious payloads. The 'Password-protected archive lure' heuristic indicates the document likely instructs the user to open a password-protected file, a common tactic to evade security scanning. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lhorizon.ca/uploadHorizon/file/22188829882.pdf In PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/j7aseg7sghbpjnhr4drdmnbmhr/92143967135.pdfIn PDF document text
    • http://sciattella.net/images/file/pibaxi.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210720124610.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/mepalorelavimus.pdfIn PDF document text
    • https://laser123.com/geektic/files/73047307967.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/55782332834.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608cff1f06d6b---fazupamajubogigolado.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/88170246283.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/21328863813.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/malozumuvevuponurobax.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/ligapol.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/47251282692.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/lofifonudogujezixi.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/14868995763.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/tasezodawanotasox.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/15402347651.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16107556d8dd0e---mizefibagujomew.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/l4vj101glgt4b2j43n7u4iit4u/77935110959.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/94ec1e5eda5f105ddef12d30372bf7b6/piluxuxobevalezis.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021060604445035.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa17a00dc8---2923810441.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=reduce+pdf+file+to+very+small+sizePDF 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_off0000d9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D4 18516 bytes
SHA-256: 5210c2b8f9c6703c960c1bb091b25d525b79149322449abc1137b0204c027bf5
font_01_sfnt_off000109e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E5 11064 bytes
SHA-256: 6f1506e98b1ba53eeb41dd1433e29723e8045bf326178dd3a5c8a6032652bf28
font_02_sfnt_off000123c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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