Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd114b0255380913…

MALICIOUS

PDF

69.3 KB Created: 2021-10-03 00:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2994ab48940af31579cb8f11e4d66fe6 SHA-1: a66c851330413105eef18e04a9315e03e8fe4f0b SHA-256: cd114b0255380913a3f5c1f23472ee6faf38b3d0e29430281fd6e7292b8e965b
176 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pixomot.ru/uplcv?utm_term=au+sable+meaning
    • http://tobn56.com/UpFiles/file/guturopibowat.pdf
    • http://nail-free.com/ckfinder/userfiles/files/wofibodidofarude.pdf
    • https://gangwontaxi.com/FileData/ckfinder/files/20210926_36C66C5E016D07E1.pdf
    • http://gwardiajuvenia.pl/zdjecia/fck/file/belil.pdf
    • http://smartpaintingplus.com/userfiles/files/sewokojaza.pdf
    • http://www.bash.cl/media/file/38382620760.pdf
    • http://demkapi.com/resimler/files/80704876370.pdf
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/gisowisuzujoponamun.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/ph9k8tf62c3808bbbscfvcc4a1/97586345408.pdf
    • http://jamalcar.com/userfiles/file/51876536954.pdf
    • http://firewheels.pe/userfiles/file/61475373332.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155f395db55d---fupibonovavizatovomap.pdf
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/vukakuboj.pdf
    • https://macauroommate.com/ckfinder/userfiles/files/8544136490.pdf
    • http://paglialonga.it/userfiles/files/muponalogefagura.pdf
    • http://trustycctv.com/ckfinder/userfiles/files/kokulevawivubopalulawe.pdf
    • http://crabandclaw.com/uploads/files/37482338774.pdf
    • https://implant-drill.com/userfiles/file/41964455528.pdf
    • http://custom-mugs-factory.com/uploadfile/files/36507343013.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/79ab2f3c2f32ab9ff66e3f23a47307d8/99225122777.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bc3dfb46e2---61965872689.pdf
    • http://www.ez4parcel.net/upfile/files/2021/09/16/zexal.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae98.bin
b118121c2989f08c5204e525bf94ea290c98c2cc3d996b18285b3a80582d9ae2
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE98 10352 bytes
font_01_sfnt_off0000c5ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5EA 16792 bytes
font_02_sfnt_off0000ddfc.bin
d4db6fc26f3abb213fa15ca470aba3c5d123884e22e5a516675f395a9b617ada
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFC 16496 bytes