Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff08e624c2340fc…

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 20:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e72b331b1ca598be55485be9439fda8e SHA-1: b9d4920e110b35457cecb8569b9bb15280973c8c SHA-256: cff08e624c2340fc7559d21e37574b35294510c00e50a12cff296eab16c98d61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the overall structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=example+of+possibility+modals PDF link annotation
    • http://2ds-creations.fr/userfiles/file/21554695401.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/49217247419.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135b30286f4f---tumigewemodomenizaf.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/68795613517.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/98086087871.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/nomotevexoxakamuti.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/vokewibemuxomesoxav.pdfIn PDF document text
    • http://gazetavk.ru/img/file/rabejipigatifep.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/zelez.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210902011316.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/levomujuzalil.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/datuwopewazonovi.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/mamotidesirazefomapejoj.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/jejuzemafositekebid.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/ziwisonenifegigijajuke.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/nitedunagaji.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/31013418066.pdfIn PDF document text
    • https://maturana.cl/upload/file/faliwo.pdfIn PDF document text
    • http://tochalco.com/uploads/files/padorukupelap.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354241d5163---sijorijikuvivis.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/21665078520.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/48986898474.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16141ef56584a9---mabibita.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/db7da9bc63876dfce85975e7dd029a85/55408838971.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614439fb9cf13---keruwavavewo.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_off0000d56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56C 10792 bytes
SHA-256: 3999ae6b60535b2d3951363b3c0945afdde552008b093509f601a95d3c3e09b1
font_01_sfnt_off0000ee18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE18 17772 bytes
SHA-256: 3ebaaa032daf34cd222f82379c9bbdd56d5d8cddb79c1f98b40206bea1112a58
font_02_sfnt_off00011bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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