Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c9ca9fa31a144b6…

MALICIOUS

PDF

83.5 KB Created: 2021-06-29 05:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b2858b943a4213dfc57fce4823e6b0fe SHA-1: 3131762fdc816ec043b26370f5b3a5a3ac9fb5b6 SHA-256: 9c9ca9fa31a144b68f5652dc6bd7e261ad0abb5d8e69bb7dc918f00329cb64f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on compromised CMS platforms or disposable domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests the document's purpose is to distribute malicious content or phish for credentials through these linked sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://archism.ru/uplcv?utm_term=quotes+from+alchemist+book
    • https://hanmarklight.com/UploadFile/files/gisojuzi.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/hhf3ifl5ifsbaarmse4b4d3ihh/81971150413.pdf
    • https://armagedonspedycja.pl/files/file/15486406146.pdf
    • https://swagath.co/new/ckfinder/userfiles/files/dixofaziguxesorisafeluvep.pdf
    • http://uralinteh.com/uploads/files/lonad.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/df4c5f512ea878f8cae7caea1e0d6b08/tatalixotofoxupa.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/469c2a637987178d239fbbca351b26ba/98301069230.pdf
    • http://archimax.ch/dynamic-images/cms/file/lejej.pdf
    • http://baigeleather.com/userfiles/file/37795814112.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609f35c673f97---pifovonofanakiguw.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3f7315327---47373158305.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/c503c216cdd99c9fa938b3442d7f956a/38058658108.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/64gckh6etkfke5httdnadoib4u/dijexuruvejavukabo.pdf
    • http://infrabud.eu/fckpliki/file/noperuzixuvalatixone.pdf
    • http://dogable.de/userfiles/file/28715769365.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b89787a0067---29458373851.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160821b078b972---39264053094.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff94286d3e---23835049435.pdf
    • http://alliusie.com/userfiles/file/sebiketasodazesugival.pdf
    • http://panteres.com/files/files/jagatoxonawuw.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16076f58030682---gajeleletipejirabofaz.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/193635aece16ebcfba87a88c90c547cb/pogevazezolalafurofifuraw.pdf
    • http://botosani.ro/img/uploads/file/13462982574.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_off0000e1ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EA 16792 bytes
font_01_sfnt_off0000f9fc.bin
2bf9c2b71be1107686e2f43a28c1327a51b7913e5fd6dc04f2d31e97ed1ae744
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FC 17464 bytes
font_02_sfnt_off000127d6.bin
d4ac99ce24f6cfe6af99e57b04a5c6d1f2cc46fcadb3d8ed94f7ba18100bbd61
pdf-font-stream PDF embedded font (sfnt) at offset 0x127D6 10888 bytes