Malicious PDF — malware analysis report

Static analysis result for SHA-256 53eda6f7f61b329b…

MALICIOUS

PDF

81.6 KB Created: 2021-09-10 15:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af3443775e1fe6f42b25a5beeb104d7c SHA-1: 0f1dcc3a112d7026c4e0d1caf34fcbc8cb4f8aaa SHA-256: 53eda6f7f61b329bc1a960ed0b0e15982c5428e927a4697c7d726faf5924aa39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links are likely designed to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://gowowdeli.com/uploads/files/fupegekuxi.pdf
    • https://bustotoronto.com/userfiles/file/65585082333.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edff295025---sisojopikedoj.pdf
    • http://ziva-muzika.cz/files/file/xitebajadapazoda.pdf
    • https://hantverkarenisandby.se/UserFiles/files/gaxop.pdf
    • http://humidorio.de/ckfinder/userfiles/files/zorujetelorifixefedej.pdf
    • https://danielstrehlau.com/userfiles/file/96741781136.pdf
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/62980310745.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/ajm3p525q5hd9l9mgb3v3lmcp2/33170309402.pdf
    • http://ebara.com.hk/ckfinder/Zenith/userfiles/files/kajakoveloviribiwinewex.pdf
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/netuburuvenuluta.pdf
    • http://syntra.pl/userfiles/file/77265831365.pdf
    • http://the-bom.kr/upfile/files/34991615321.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613341697b5a9---42501612801.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161383825ec6ff---88545545635.pdf
    • http://skazka76.ru/pic/userfile/xazugidugixixamizepo.pdf
    • http://ckud.handysociality.com/upload/files/75482305516.pdf
    • http://urgentcarepb.net/userfiles/file/25315582159.pdf
    • https://praktijk-fix.nl/userfiles/image/file/88038446658.pdf
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/ruwovuvaletexa.pdf
    • http://zxpgw.com/userfiles/file/jutirom.pdf
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/17121343246.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=juegos+de+pokemon+para+tablet+android+gratis
    • 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_off0000d6cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CB 16792 bytes
font_01_sfnt_off0000eedd.bin
9aa63528cff27558bbae6892919d14e99181c0033d0c4e4fefe1e8593622ff5e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDD 18324 bytes
font_02_sfnt_off00011d8a.bin
1de4c9cb83eb744e1c676e467179be17ea21d228402aea655ec87c00201eff17
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8A 11056 bytes