Malicious PDF — malware analysis report

Static analysis result for SHA-256 234f622b84706202…

MALICIOUS

PDF

96.8 KB Created: 2021-09-05 19:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 33e54e7d6951c63fcb12ab277d0ef7fa SHA-1: 694a2a2ae172648b8daa8de9df3c943c9466d6ef SHA-256: 234f622b847062029a12dcd84831eb2e58c87242c63701d883851070917be059
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its true purpose, which is likely to facilitate phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://gps-tw.com/CKEdit/upload/files/danulaparogifatib.pdf In PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/33517709691.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/potekuwewawi.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16079d63789e7f---mubim.pdfIn PDF document text
    • https://lemanssrl.it/file/zuwuboxoko.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/fudegogobix.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/7e36ea0e2953106dac6476f45c7df177/tugani.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/numolejaboxirojuleson.pdfIn PDF document text
    • http://charlotteellisscholarship.com/clients/a/a5/a56794a54ce3a7e2a8fdc514f00cf952/File/xuvemar.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/60357293138.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071d8cab3796---vurem.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/zusumajazukaw.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/fb3aed1f5b369a1b20f57a0425623089/28001353279.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/8d0125cf3c749402a5c9997ec913d9b6/tepize.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/nufuwawukifojidawuviduge.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/48994000583.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/metolujotikafemabeve.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d85868bee2---24430450907.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b553f477d6---54544978373.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/41463880374.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/wonobasim.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/kqburo24g4opufgmffjvgauc7d/28877309767.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d8c21064139---viwowinewujolugekatuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=anorexia+y+bulimia+psicologia+pdfPDF 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_off00011245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11245 18320 bytes
SHA-256: 69415c0d0860672e09c7c17c25e522977e057d122dd36b869045dfd25ac81274
font_01_sfnt_off000141a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000159bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159BB 11300 bytes
SHA-256: 9d647400fc34fdf3f1d4e5ca6d305f159f9bb7915a151a32fd2f3eafd7a9f400