Malicious PDF — malware analysis report

Static analysis result for SHA-256 c69b85af366b741b…

MALICIOUS

PDF

80.7 KB Created: 2021-09-10 09:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 227233d2abcfbe4b98db7d4125898307 SHA-1: eb14c0e56cb8921efddd81bb668db7ecf2a48158 SHA-256: c69b85af366b741b71ae863e3ec69824414d0ccfe087103dacdf5d662f4af3e5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, indicative of a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading a secondary payload via these links. The document body is unreadable, providing no further context on the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vishalahospitality.com/ckfinder/userfiles/files/78716417908.pdf In PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/vavunipixapa.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/zugawesiwalefe.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/81560065004.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/73349100184.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/xediviwajorivisakedaxi.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/musedajimabimumorovuruk.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/24706176310.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/5521660009.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/jinev.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/67253947432.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/bilimetikitavitupadurixes.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/rozarepelig.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/12061388427.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa7458fc36---39250354890.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/17047772171.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/f02d6104000ec23cc56ca26df5177fa5/dorumux.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/79258214038.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/66435947637.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/dijowewoxewexatokunalevof.pdfIn PDF document text
    • http://kwartetproforma.com/userfiles/file/51104744114.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/161382c1d1062e---jitaperononelifuxuwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=simple+root+androidPDF 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_off0000d809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD809 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01B 18204 bytes
SHA-256: 8661a7aa59dc53c224c29bd8cf0babf2e803f6742d26896948a10e1b6eefedb8
font_02_sfnt_off00011e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E83 10460 bytes
SHA-256: 26944230a0c5ba944be341766c54398606a97c2faa0a8b5fc4ef6bf680be6445

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