Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6e771ccd59e5e21…

MALICIOUS

PDF

90.0 KB Created: 2021-10-05 11:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e55047732e33a6831b1bff0d0ead1da8 SHA-1: a0c0b1ebdc993f7996a70cf406489b24574e2d08 SHA-256: a6e771ccd59e5e217a7d027901ba6d53c530209d258dac6d8e62e5a0fdab4e4e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://inverpalmas.com/aym_image/files/53804390978.pdf In PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/juzagopomax.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/bulaperawebuwut.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/nuejl3nnpav9chevp5b531cmi6/takekekixudeze.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/furisovalilusejulap.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/96296680844.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae33bbac82---84816278191.pdfIn PDF document text
    • http://rhondachem.com/d/files/87907265249.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/vuludolabojesozabulowezor.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/61062530225.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/11707537174.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16145213c2dbab---dunamutepuvuzaval.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/35065722605.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/9461655392.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/vejiraserukib.pdfIn PDF document text
    • https://petala.gr/userfiles/file/jirebasetakanikugamugiv.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/74388377435.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147de9771d86---jipijonifulov.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/tuwajugamijolinu.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/58842770543.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/bedemurivezobewali.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/filimewosot.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/xerawitadag.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/97588207759.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=watch+13+ghost+full+moviePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F3 10960 bytes
SHA-256: c35b464a46d90218ca283e932dbcd7c5a80502ba1e626cff844f5e983a56fe33
font_02_sfnt_off00012a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A95 18244 bytes
SHA-256: e48d7d124ad3bc0380d8ea8a6058e845f9afb3ef06b4ea564f8e0ff3710c58c7

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