Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc90154e308b8f56…

MALICIOUS

PDF

83.3 KB Created: 2021-06-25 15:38:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 543b594c8cb75eaf7db353df6fdeeaf9 SHA-1: e7234a6ef947d87c77ea85f8d96407e917ddcb0b SHA-256: dc90154e308b8f5622e6ac3589130021b3c93c6e20e2b687c6f17b0323b82717
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a link farm pointing to compromised WordPress upload storage, suggesting a lure to download a password-protected archive. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs and the nature of the link farm indicate a social engineering attempt to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://asset-books.com/userfiles/file/63062433976.pdf
    • https://tort-art.ru/userfiles/file/83142773445.pdf
    • http://zaun-produzent.de/userfiles/file/riwesuj.pdf
    • https://mvservice.it/file/ketidikot.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/vk01bvnuijuh01jcms58cab0vh/32842692574.pdf
    • http://szentimresiklos.hu/upload/file/gopamanivelasazololaki.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/l890alrl0a6jqfuvmlgu5c24jh/78262785492.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbac6e78f9---34908832146.pdf
    • http://tlxzkj.com/uploads/file/052027418985.pdf
    • http://maslag.eu/userfiles/file/10474514366.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f55ae7756e---gipedijemeluzukonutakipod.pdf
    • http://retco.ge/ckfinder/userfiles/files/87238940221.pdf
    • https://martabaktelor.com/contents//files/44678650827.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92b1de1555---bubotadubifunetut.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/54c69aa162e969833bda1e4a7f44c379/zojosanurib.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160821e0759f8f---xobafijevusipeteraxiwumo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=who+impeaches+government+officials
    • 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_off0000e069.bin
5dec9f7ab96dd0ab60f508cdb06fa278d2d7f8de10663aea7c88bbaa2b4e850f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE069 10984 bytes
font_01_sfnt_off0000f9cd.bin
96dd7bf3c161a328101c01c47f1feb58800070816cbbe523dbabc11a5c65b5a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CD 17560 bytes
font_02_sfnt_off0001280c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1280C 16792 bytes

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