Malicious PDF — malware analysis report

Static analysis result for SHA-256 33ea664bc3de03d9…

MALICIOUS

PDF

74.6 KB Created: 2021-09-09 05:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6165658f16c3bbc2999e53c9a52d1b7b SHA-1: 98c49c2edea1b3952544fe2a5b746cef30121079 SHA-256: 33ea664bc3de03d930e874ea359c0963428b50ebce007b98b38ff38c8b00eaee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to compromised CMS uploads and disposable hosting sites, suggesting a phishing or malware distribution scheme. Although no scripts were extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to attacker-controlled infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://birzebbugastpetersfc.com/files/file/72229111486.pdf In PDF document text
    • https://funbugs.ie/files/file/12913831063.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/37817088320.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/pozafukabetagujas.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/43925631958.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/bidokibo.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135a5ea2b50b---35010151246.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/74263279124.pdfIn PDF document text
    • http://thedreams.cz/files/54439485986.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/5d7e72215755ed0143f8c673443eff8d/rezawixaxusumine.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1630768158.pdfIn PDF document text
    • http://rts-3.ru/upload/files/48565346188.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/24285090869.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613252a21d1a3---98113299957.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/bulavodiponinalumogige.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/39587822136.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/nanilurowikex.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/26715209367.pdfIn PDF document text
    • http://sjhtractor.com/d/files/38678780563.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/vozixapajivirurovev.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613837db11508---pefabubobopurixapizireb.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/82882256843.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16130390907764---pitujowufojanaberu.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/38960699705.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=adelaide+fire+mapPDF 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_off0000c1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F6 10152 bytes
SHA-256: caafa1d5f39af9cb3b620609a49bb7fb2a5a40779a3ca8ca03e8e86abdd0bd3c
font_02_sfnt_off0000f08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08E 17184 bytes
SHA-256: 885043cdc2b20f5a7469078b28eae0e36173698eec6a8503b2409528713f3d9d

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