Malicious PDF — malware analysis report

Static analysis result for SHA-256 5393f6bb512c8083…

MALICIOUS

PDF

76.7 KB Created: 2021-10-01 19:32:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b9eb1abe68c802340cd9da8bc43dad6 SHA-1: b316606a9cb85692119999c9510f9e2a984aa1c3 SHA-256: 5393f6bb512c808386715c27d2a9f500adc9958d630de1b8dc40b7c6280044ad
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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 http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/luxamoni.pdf
    • https://open-call.fr/uploaded/files/bazufonekuwo.pdf
    • http://matstravel.ru/userfiles/file/gifemikezepugupem.pdf
    • http://xinyuemu.net/assets/202109/files/20210919193132362833.pdf
    • http://hunicorn.hu/userfiles/file/gafowutugixi.pdf
    • http://hpworld.hu/data/pic/Image/file/51631413529.pdf
    • http://kelkenaghshband.com/app/webroot/img/files/71197355836.pdf
    • https://snoman.mb.ca/ckfinder/userfiles/files/rexujimorozaxiruw.pdf
    • https://cargotavio.ru/files/file/80111086184.pdf
    • http://sendedianqi.com/upload_fck/file/2021-9-19/20210919141610207008.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16139942b9e0f7---6432390654.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/c65874caa9ff874de910b9bcff63cc78/60517370360.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140e308abf2d---rejeturavuz.pdf
    • https://pediatricpotentialsnj.com/PP/PPpng/files/lutaderimawisa.pdf
    • http://montesantangelo.it/files/files/lujiwozutilefoxowede.pdf
    • https://ls-machinery.com/uploadpic/files/202109260534329007.pdf
    • http://lnianemarzenie.pl/userfiles/file/wepezudegiluxusukek.pdf
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/zigogiveladuzuxakaper.pdf
    • http://joyerialaplaza.com/ckfinder/userfiles/files/riporasavemazerukibu.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/014c832d1e09d41835a3764001ef78c5/begujujesaregalifulokam.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148b30280fcd---4593142986.pdf
    • http://botosani.ro/img/uploads/file/mumorarevojipexotoxe.pdf
    • http://microcement.ua/userfiles/file/46761167381.pdf
    • https://muzeumkonstancina.pl/attachments/file/tibabawanefenu.pdf
    • http://uni-farm.pl/ckfinder/userfiles/files/7700767042.pdf
    • http://stopguepes72.fr/userfiles/file/kafovuwetunodo.pdf
    • http://kronospan-mofa-hungary.hu/editor_up/46724795230.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=cid+episodes+new
    • 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_off0000c4da.bin
3bcc98354fff3a655fc4660ed3d8bd93027a874fb042aecb0e43ac6887a9c016
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DA 10096 bytes
font_01_sfnt_off0000db83.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB83 16792 bytes
font_02_sfnt_off0000f395.bin
3547845d2e9aa266b71efd9f34754b806eb96288962a2e0ea262286571387637
pdf-font-stream PDF embedded font (sfnt) at offset 0xF395 19220 bytes