Malicious PDF — malware analysis report

Static analysis result for SHA-256 91bfaf4e07b0dc3b…

MALICIOUS

PDF

78.8 KB Created: 2021-09-19 13:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fa29a45da2081e46ebf0bccda415a7ee SHA-1: cd1601818dc3bdc4b1d7e3260fa791876049d433 SHA-256: 91bfaf4e07b0dc3b732ce77786a1282b937ed0f68c0bda65ff13635a0454ad11
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the heuristic findings point to the document's primary function being to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/161469c8e2af7b---53463291645.pdf In PDF document text
    • http://lamorenj.com/userfiles/files/71278293974.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161330080b6f7f---pojebowovegerilepu.pdfIn PDF document text
    • http://pataibicaj.hu/userfiles/file/renowebinofuxewegujepe.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/bufesogikukusovipunoki.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/51251104127.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/58444743829.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/tetaz.pdfIn PDF document text
    • http://kbfrutos.sk/images/_file/jiwopixosutozorinan.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/sugafejibufupe.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210914191633.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d6145d49c---fonelafexiwoxexojuju.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/dafuta.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/damiserakatibawunavow.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/f2706278e373150f8d6c8b36f5a55770/57913506830.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/sikerekenunotemufirejupe.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/42886373368.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/jodegepevuvasenunagive.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/22077488578.pdfIn PDF document text
    • http://iccarrentals.com/files/file/80539907458.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/52238696522.pdfIn PDF document text
    • https://domilot.com/uploader/files/70377597436.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/semog.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/15991038838.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+make+live+wallpaper+iphone+xrPDF 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_off0000d060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD060 10688 bytes
SHA-256: 728193c8a4cc85f5bca85380554d5d9ee6753512eccba0f53ad8bdfebd3e881f
font_01_sfnt_off0000e8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B9 17332 bytes
SHA-256: 825185a8915377ce69e287d8041ce1b96964ea45ac6fd5f3f8fd42dd6f636cd5

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