Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bdade28170bb6fe…

MALICIOUS

PDF

79.9 KB Created: 2021-09-09 04:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 31f0e57049bd0e0c7f2c0bbc55451b0d SHA-1: 82876f333eaa314a95cc005ac3ecc141eead1c80 SHA-256: 4bdade28170bb6fe1e378b64fbade32c5f20dc509be11daa1c3f61f714eabb1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS uploads and disposable hosting. While no scripts were directly extracted, the nature of the link farm suggests it is designed to redirect users to malicious content or download further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/39df2ace195190a3befd474fd4d319d9/miduv.pdf In PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/muberodigaguba.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/53349313418.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/44767344502.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/28345970869.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109082346165698.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/65678067759.pdfIn PDF document text
    • http://soles2walk.com/data/file/ninetojazifim.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/21266655313.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/totekodesutekokefetavu.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/63808372388.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/kibubirepovada.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/zigesupigedubosesisexes.pdfIn PDF document text
    • http://soles2walk.cz/data/file/89373796899.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/41793684461.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/38364810733.pdfIn PDF document text
    • http://salespate.com/userfiles/file/sebidemitof.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/tujikeduzojefajudan.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/32518775399.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613205ed4c804---80182466051.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/1e0edbd24d3f14a90eb6e8da33fb44b7/20025272981.pdfIn PDF document text
    • https://tch.lu/files/files/55322653817.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/161319b37146b7---90715094906.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=turbo+game+vpn+apkPDF 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_off0000d2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D6 10552 bytes
SHA-256: 42c573b9adef829964019b65c8f90c579304a21ab333eb9b7c7f78e4e8692e92
font_01_sfnt_off0000eaac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BE 18216 bytes
SHA-256: 1b35c644c7688daebc8af430539d3e5ddacb8f452a070ec56c40f664328256e9