Malicious PDF — malware analysis report

Static analysis result for SHA-256 f33caa422b6bf3e9…

MALICIOUS

PDF

71.3 KB Created: 2021-09-02 14:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0349288a248fa17de45aafcba678deab SHA-1: c2251abb1f4abff7972f652adf62ee3f5b1f0aff SHA-256: f33caa422b6bf3e94e48a6bda9d1b95eaca4e7ac5478dc5df12a7cb22a6c1277
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/d9a1680257cab60031652940450cfbb0/muwezosifegobakupojim.pdf In PDF document text
    • http://heryeryesil.com/resimlerfiles/wapamepud.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077c9a744fd9---tevisupiwinikulu.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd6689d5ce---jumej.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/80285186610.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/59939296196.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/1ca02dca974756d973c818bfb89d4dde/48895192155.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/zirifali.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/bipuwolunexowit.pdfIn PDF document text
    • http://devison-matras.com/upload/file/16497777805.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/lagarexame.pdfIn PDF document text
    • http://solsethreunion.com/clients/f/f5/f56c6d7ba488b74ef40bd02d3fc4d0b2/File/fojalatumaweni.pdfIn PDF document text
    • http://piau-po21inn.com/CKEdit/upload/files/vetagiduwez.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/pepedovilexolopebepo.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/dobugolofob.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1611890c4ed2e7---kasetidujofotax.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/m4u5tqlj5s44nt0a2p3ra5b30v/fusipodoxa.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/7708088359.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/a9716c6a713fca12e9be085a4c7e267f/bumuputidezerivuletifa.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/5jhir24476aocl7iql77s7da24/jimepisulewapud.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/92329021256.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/41351501962.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/0ed5953e1fdabc8c48d90d477add6edf/laregapure.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=inferences+worksheet+1+answer+key+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_off0000b6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C1 10872 bytes
SHA-256: b3301f0c71c43724590f82b6ca9b960b0428308db1b0e35abe10b672fe07735d
font_01_sfnt_off0000d000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD000 15300 bytes
SHA-256: cead088cdb43db8b3f8bb151b0ad4aaeea604425dbd4e872c1faa2debb1c8129
font_02_sfnt_off0000f5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.