Malicious PDF — malware analysis report

Static analysis result for SHA-256 d88fbe6a80092e55…

MALICIOUS

PDF

82.4 KB Created: 2021-09-02 17:25:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f01f2dfe8818c0740dce7257c4f6bebc SHA-1: 305c4c98db1f9773e911f58061adc7492e304c96 SHA-256: d88fbe6a80092e5554bf03bfed076d602f1bded4e22d4ef8de9cacb551bd27eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure indicate an attempt to lead users to malicious external sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.ftha.org/admin/ckfinder/userfiles/files/61509152187.pdf In PDF document text
    • http://charivne.info/images/file/tujiropelofek.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/4760b70dbe97b77662daf7a50a01ebd8/66369367089.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/92119853494.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/53787064764.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/dobisezunexepokawo.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/5f8d71cf7ed3eb1097bd410abe629c4e/fuxoferekusifubakeg.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/78373007535.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/2f3d7c13f7ae4092001382f5e7b9fe02/65522187862.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/08kg6ogkqlcap00kfivfkf65c7/fatilavonukuxor.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075e3a47661f---bibawafenuduxowezezepewu.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/66851fa8425ac5f4f957be56eb0c5910/3570370718.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/15849310480.pdfIn PDF document text
    • http://onlinevay.com/upload/files/43031492215.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b655e5ee14d---41080740100.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/66421206348.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/j598mr81bh1dq4gplihc634jt1/duzusakojasakitojimidol.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210617_4497613BE20801EA.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/9510fcce04932d23701dd5675da69fff/todunepedov.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/fonelolapozukuditezigusaf.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/qtcv09oonn9bn52him9uk1nfqm/disuw.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160aac9b838c79---16914155523.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d905444e3b9---63719325407.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=nptel+mechanical+strength+of+materials+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_off0000de27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE27 17064 bytes
SHA-256: d13d7795c833db2e80880b4b466e730ba5322fcd9b62d52ee5b1319960dae93f
font_01_sfnt_off00010a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A51 11044 bytes
SHA-256: 1f76911cdfc3556be965559ae366afe90d8f9fbe4a88098826c5713dc8106164
font_02_sfnt_off000123a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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