Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e6e91145821e1d…

MALICIOUS

PDF

74.1 KB Created: 2021-10-02 09:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb6f69d7296aa77910642c60a69e1856 SHA-1: 5e541e7a2169c23592537697549fe302b286ba3b SHA-256: 84e6e91145821e1df918f11dc85bcbcb5327c3d09da74b872fad09b22ffd2b38
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable hosting. These links likely serve to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=what+does+90+ah+mean+on+a+battery
    • https://delaneyllc.com/ckfinder/userfiles/files/60227483665.pdf
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/wemibum.pdf
    • http://invismortgagebroker.com/images/file/20657996401.pdf
    • https://kristaldicarlo.com/userfiles/file/bafunorisazufoxef.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132d4ef8daa3---97141008554.pdf
    • http://itaxabc.com/userfiles/file/20210904140634_623951409.pdf
    • http://westfallassociates.com/documents/file/38639951763.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143df54751a3---mizibetado.pdf
    • http://kehlux.lu/userfiles/files/48455872067.pdf
    • http://dsagco.com/Upload/file/famasajesilireteniletas.pdf
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/34933498899.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/0cu07rd2a55k03rg6d2ob0c0qp/63100577443.pdf
    • http://quartierdete.fr/uploads/fckeditor/file/ruwekeluwozagituge.pdf
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/20665105801.pdf
    • https://farmacieitaliane.com/documenti/file/tifadelufurowavuto.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614e64868eba9---81015719822.pdf
    • http://zgic.ru/!upload/files/61946436459.pdf
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/84080890978.pdf
    • https://cabinetscounters.com/ckfinder/userfiles/files/17728571101.pdf
    • http://seamacros.com/upload/file/89203808186.pdf
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/74735698728.pdf
    • http://1night2day.com/UserFiles/file/binifajejuzefawak.pdf
    • http://makesomenoise.hu/upload/file/nugukatalovopu.pdf
    • https://alakharia.com/public_html/userfiles/file/30507448555.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/34661566f61372b43a5c53aeadf8fb5c/96576739855.pdf
    • http://axiomestates.com/userfiles/file/88478435852.pdf
    • http://vuason.vn/upload/files/tiruzonexikepiwiji.pdf
    • 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_off0000bb96.bin
f54e2252a30d7f6685bd70a6f4a840afb4b18c288bffef4c21914606c4f6bd6b
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB96 17624 bytes
font_01_sfnt_off0000e911.bin
a3eaefec4bf0afc88f68671885c7ec11e35bf1d1c4a2cc55092be11aeda93046
pdf-font-stream PDF embedded font (sfnt) at offset 0xE911 10912 bytes
font_02_sfnt_off00010230.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10230 16792 bytes