Malicious PDF — malware analysis report

Static analysis result for SHA-256 2acd9d0f2486d59d…

MALICIOUS

PDF

85.5 KB Created: 2021-07-03 22:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b82644e7cc850608a5be2e7b04d9be6 SHA-1: bc94f74e39167de7837728f01056a363b1a24bda SHA-256: 2acd9d0f2486d59d52adfdb4d2e7cc56fb9b2e2085e9580f211e438a380c1753
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, indicating an attempt to redirect users to malicious content. The document body is unreadable, but the presence of numerous links to potentially compromised CMS uploads strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080a0081935e---sapazebolulap.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0e22496d3---76368191245.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/gjdgteovfa6b7hvdr5tnd68oh7/guzuleporolukejaditoxi.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/b2ce597ffe054a915345f70bc5e55455/73606366748.pdf
    • https://tkquiz.com/userfiles/file/87448975083.pdf
    • http://ducthoaudio.com/upload/files/13512599512.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/fc8vpmg8mm7cc4uopfbs054rc2/63974014719.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160760d718eaae---basupizuralasidinazeb.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077419154fe4---lajepisanup.pdf
    • http://ashioke.com/images/library/File/56276591262.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/14e22ce17b0b3f0f56b75f7a1d9dd789/95729990940.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/3oq714sth7mu1klco7pakmbos9/97626532227.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/8c2eb36b7c1d51e47fcbbf15d4d7789a/39518343816.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/0508fe13bb8dc5c1399137ec675bf1ed/xedigunefopovigi.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085bc92ab17f---73228120507.pdf
    • http://beamstraffic.ae/amb/userfiles/file/1625268534.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c038b14ec76---nuwugonuvuvufabedoposaka.pdf
    • http://globalquestconsulting.com/userfiles/files/47505503072.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f13819ca4---59258138526.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072239b360d8---26085409024.pdf
    • https://peilimineko.com/userfiles/file/xidobedaperusojavuje.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/gp8f0kc8kusiqelg6um24bisqd/20883994391.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=symptoms+of+clogged+arteries+in+legs
    • 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_off0000edaa.bin
a2c7c75b273c042b066b24c889569e1923639200dd108836ef3a9d0e2abe8d53
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAA 11152 bytes
font_01_sfnt_off00010783.bin
fcbe38997215b649d4b8d3fce90203085dbe37ae7917a570568bea499c5d3e58
pdf-font-stream PDF embedded font (sfnt) at offset 0x10783 15948 bytes
font_02_sfnt_off0001309c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1309C 16792 bytes