Malicious PDF — malware analysis report

Static analysis result for SHA-256 b170bb899db1a797…

MALICIOUS

PDF

84.5 KB Created: 2021-09-17 00:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f7d4f51cfac160936c536f6c317fb5da SHA-1: c700eec4c73764f789e057dc7699c097b55607fd SHA-256: b170bb899db1a797af4308097614411dc5ce0ac3c7dd246b0d4c28bfe2b46e4c
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous URLs pointing to potentially compromised websites and disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://cructi.ru/uplcv?utm_term=build+a+custom+rom PDF link annotation
    • http://glampingcaravan.com/userfiles/file/20210917063835.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/vunutamasivukivizan.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/jalevi.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137778625d25---mozonifejabuxaxozov.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b60788f64---guzawovabiwafufojitoled.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/20205589238.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/ac3c03d3cf961771060dc6cccddcbc98/18568891285.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/lusimifej.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/57131782012.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/bofaweranutanowizozupikab.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16134e97c48314---doxose.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/61937484920.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210917061833.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/ronexaloziwona.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/serul.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/wupapegiko.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/zabuxotijuwe.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210912_094842.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/49895835177.pdfIn PDF document text
    • http://ihdbd.org/upload/files/69054374486.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/kajagemezokudek.pdfIn PDF document text
    • 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_off0000e984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE984 16672 bytes
SHA-256: c4125dcd730ef6f1703a628302a37040a29ac8a2e291818e9c742979e9545bc9
font_01_sfnt_off000114a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A6 10448 bytes
SHA-256: 8595ee4a293d461b0c008695f2607bdb4d5cbfbfbbdd1d870e192aecc73af743
font_02_sfnt_off00012c63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1