Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7e594ec159c02c6…

MALICIOUS

PDF

93.4 KB Created: 2021-09-04 00:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 42763d656143c836d8a61c8e741bc73d SHA-1: 7470d8f3fe51a55d8f12a6018b94bed6ed9b274a SHA-256: f7e594ec159c02c639436f51baa89df43b93d7f3e937ff2f7b9b16e0b30335bd
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it is a PDF phishing or trojan. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the overall structure strongly suggest an attempt to lure users to external, potentially compromised, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://retake.dk/ckfinder/userfiles/files/jolokutale.pdf In PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160862617cd617---58120046120.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/a4v2s1kn4m4qfhoeqa0i1iuma2/belagurotizusopuderopipub.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/jk0dn3fbgseii55hg5j48q9a9l/rilovigukurupuwadurajef.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/talikorukixanolabaki.pdfIn PDF document text
    • http://rafaelokazakov.com/file/84661180686.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/57426226440.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f4d3cabe65---57384335010.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/46891334296.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/rexuroxozepi.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/wurukotidatojog.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59355103776.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/buduf.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5e80aebcd---90910623082.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d11fda6654---womevaxuvaradajunipewe.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/47031033386.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767cca379ae---gijobujaji.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/78746176308.pdfIn PDF document text
    • http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/55394511615.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da61f65051---tutewatulajafozosavof.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/45d86e64a7a9f1a4cb24b43f347191cb/95330214064.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/lizejabo.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160856f7c9aae3---55880048075.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/bixorakurek.pdfIn PDF document text
    • https://podimercrm.com/img/files/gezosebaxov.pdfIn PDF document text
    • http://manajrgvaaradhi.com/cms-uploads/files/76828699772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=rutina+de+ejercicios+para+abdominales+pdfPDF 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_off0001040a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C21 11196 bytes
SHA-256: bd705b6616a8dd9f7239b8ec1899740872d83098841b9f9624697d288c2b46ac
font_02_sfnt_off00013605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13605 19348 bytes
SHA-256: 89165043bbee0f5ca0f6d4556053851b01a50c8d61877a7744ff1754f33d937a

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