Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f6bc50134bd5e1a…

MALICIOUS

PDF

73.7 KB Created: 2021-09-07 21:34:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9b404d7e071d4c5b0b0f87ed84e02d42 SHA-1: ef4932931ae38aafa2a38e9328b3d59b29c98c0e SHA-256: 1f6bc50134bd5e1a652216ffac04eb955975128e415fc07c5c17d4b534c3094a
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://inwebjor.ru/uplcv?utm_term=wiener+linien+u+bahn+plan+pdf PDF link annotation
    • https://biothiennam.com/media/ftp/file/27742719126.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/96424994975.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/1033085744.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e6fd30b12---85736361072.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/62649833876.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/vanob.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/95349133065.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1630697380.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160da1900cd897---dukejo.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/suvetipuvuwuk.pdfIn PDF document text
    • http://quinta.cl/upload/files/vawogubifedajidijux.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/rewojo.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/10162947688.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f44be5b6c2c---66378794670.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb16ccace8b---pameg.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da2f6f3ec7---gafilanovugowinuboki.pdfIn PDF document text
    • https://mfdesign.hu/files/file/domuwidogipolefip.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kalevexikar.pdfIn PDF document text
    • https://dienlanhbachkhoa.info/upload/files/mubusekepepabogi.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/5gug1a57eklhi7841p6p6986hg/80028285801.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607807d06578c---19067022727.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/kpuer08k4gv58fo2fpauuuan0b/vuzagewezilawo.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_off0000bbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FD 10440 bytes
SHA-256: a8002b22da64f7c235ef5d8098d8e3ca5f445f103675d4333d71f89d3d48b31f
font_02_sfnt_off0000eb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB46 18328 bytes
SHA-256: b06aaec67975380a1c899582d6a94cad67809ccfc86882afbdc49ddfb1a5a1a3

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