Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e168c1ee244977…

MALICIOUS

PDF

85.4 KB Created: 2021-07-02 12:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae551c02d5492190512319b684f52952 SHA-1: f0604bd1f1a94fe9e76b25e3db13b7f0552fe6d4 SHA-256: 85e168c1ee244977178b0f619c0b0f4a5a89b785d7a4a4e090ff8debba041741
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic firings confirm the presence of a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55c167669e---zuveme.pdf
    • https://jokerprod.net/userfiles/file/53023023419.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/43971921590.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/2c2daec08688580392d3a9580a00dbba/13427488458.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/ab98fcbec7c185832a2cd8f2ff059fef/95342207582.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/ue1f69ov211uad4ns5ekl1meh3/talazilekowi.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc897364e7---65993464112.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609450b2e84ba---teroz.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16070229cdb50a---lepatexibefofopaloxefi.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/cf55cb84ae96ec27b1c13423e4bd325c/parobisarokura.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/1fa795bdfbd3265e247ec82aef589f4c/85052986494.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/si92d02o264h6itag6se7qd818/49420077612.pdf
    • http://duszek-lasu.pl/userfiles/file/kexal.pdf
    • http://saigondome.com/uploads/userfiles/file/74368944198.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/e4dfc22032f8f5140d473adaae85efed/gaxaresun.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607affa323c82---velexusoridasolupabizujig.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/d3fa26b4e8f31d3c6f1f53607f77392d/buvep.pdf
    • https://bliznacite.com/files/97587952174.pdf
    • https://edbcagliari.it/file/nidasovubexofujo.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087f6497fc2c---zisexebisarolijo.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/9170888751b70dd825534df1542bcd3a/gimodofekereluxag.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/d34a70db13339b4ac637f43d027ede52/pavisuwukebuzamigovag.pdf
    • https://stehovani-ostrava.cz/static_pages_files/file/1281228248.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608594b14e14c---18600270107.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=wordpad+how+to+save+as+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_off0000eb2f.bin
b113dfe15eb62b590960c3f2f80b5f1681efab378c9f9c3260848a4a2b6a3938		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2F 17264 bytes
font_01_sfnt_off00011888.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11888 16792 bytes
font_02_sfnt_off0001309f.bin
4f07e3b8d0cdc6dd303e299716535213b1aaabb1507506c356912e127df27fa6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1309F 10496 bytes

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