Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7463138a3da56a2…

MALICIOUS

PDF

74.9 KB Created: 2021-10-12 17:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ba22b3d819f251ba71f5496b0c28b9bb SHA-1: 5232c5d0cf854f50983baa736b3ffed14bd5506a SHA-256: b7463138a3da56a24cfa8277c1c3c622563c441968ebc647dab1b117109661eb
154 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many of which point to compromised CMS uploads or disposable hosting. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the assessment that this document is designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5345

Heuristics 5

  • 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
  • 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://droneducational.com/admin/userfiles/file/sumimujizo.pdf In PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/kudedafofafowilimobuxoni.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/komabuwizebe.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/lenuzezarizu.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/wefobudabubebu.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161409075b84ac---puvabisuxiwagan.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bp3hdn2jp4iosmjstcb0u4bvc1/97047497399.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/tafadopewikek.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/30583400793.pdfIn PDF document text
    • http://anton-joyeros.shopcloud.es/ckfinder/userfiles/files/75010337599.pdfIn PDF document text
    • http://sb-78.ru/files/file/19976242211.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/ragotavuzivewuzudopopawap.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/daxaratananinekevew.pdfIn PDF document text
    • http://yejiya.com/userfiles/file/wezuso.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/44139192220.pdfIn PDF document text
    • http://rvhifi.cz/files/file/97452999416.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/tebadujovuxoner.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/55112844337.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/87179848308.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/30218670086.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/dh2nabufpldqeqntvvkevbgb10/97041128579.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/27382912046.pdfIn PDF document text
    • http://artospace.com/pics/file/70029996054.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/oscUj7J0Gjw/uplcv?utm_term=science+olympiad+nationalsPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE22 10764 bytes
SHA-256: 826bfed1f1333742b3464be4f3cfbe206836b9ed22734d7db379e1b10f2d4b5e
font_01_sfnt_off000116e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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