Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca193303b83655a0…

MALICIOUS

PDF

82.1 KB Created: 2021-06-25 14:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2afc4e43f1483c7f00cbce25cd8ad3e7 SHA-1: 300a9784ff4fc24600b629a140bbc52d0ea75c00 SHA-256: ca193303b83655a021e4c8efa9f875e007b27c935e15c1475b7d55904c5945d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting, designed to lure users to malicious content. The document's structure and the presence of multiple external links suggest an attempt to distribute malware or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://huntic.ru/uplcv?utm_term=find+the+prime+factorization+of+120
    • https://twr1115.net/files/fckeditor/file/bazibijejof.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16082226eb7bf1---filamurenip.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/1281759da1735283abaa3723be3c2433/pizesejofiwaz.pdf
    • https://demircanticaret.com/userfiles/file/42168050068.pdf
    • http://donghozibistore.com/luutru/files/jivop.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160762a0eaea5e---ruguguv.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afbe42b413---tadexawiwosegawakoro.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/3a341dbcce0a389a2fc424fdc8672716/46295609697.pdf
    • http://cloverpark1959.com/clients/51168/File/baxamus.pdf
    • http://reicar.dk/userfiles/file/32475063913.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/871feebf0c0b7fb16849d991ef6fc990/31870402768.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a16ada89486---67731626701.pdf
    • http://ajivikafinance.com/userfiles/file/kibetumewovi.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16095e506b40c4---83816105771.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/83938mrj0si2o1idfdhggg1lku/48904599794.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62cafbe9ee---96966165518.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3d439115d---wakipoguw.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_off0000da4b.bin
7e8649b6c30ac0c97fd5dce9e082a70334475fb604d09ae120e3bcd7aade4210		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4B 17404 bytes
font_01_sfnt_off00010877.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10877 16792 bytes
font_02_sfnt_off0001208e.bin
761096a062bc77a8c85adcf137bde4ff1162ff93392c9d8bb4a104ab68b569db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1208E 11004 bytes

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