Malicious PDF — malware analysis report

Static analysis result for SHA-256 e23ba778415ae02b…

MALICIOUS

PDF

98.2 KB Created: 2021-07-25 07:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ba30ce5d12a3754df158854c54715c6f SHA-1: 577323fbe2b8b07ce19bdaf37cbdcdb90b845dba SHA-256: e23ba778415ae02b5838498a74d5b5481d6b4358ec764ea2d8b484fcb84400ba
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://chukysovin.com/img-svc/files/kotunesekavuretalivowo.pdf In PDF document text
    • http://learningkey.org/userfiles/zelaboxokalefitimiw.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e31a57d5c---93226977042.pdfIn PDF document text
    • http://atya.eu/files/file/7146129687.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160832c5c8c14e---64469324942.pdfIn PDF document text
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/24277054856.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffdba179d1---26236792395.pdfIn PDF document text
    • http://tyextractor.com/d/files/binijiluzafaredesag.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/095c5de74b771126f37a05409a14df9e/depane.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/zejerebux.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/wiwifegexe.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fba758b3efd---48764861105.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/23210820011.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/18284623058.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bd35e0b153c---xegalebofosewidak.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/n30ai752k6qsv6llk44ltpq4dm/todajasaj.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5a4634396---xajofufo.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e23462f2c58---45172863880.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff993bd0bf---28870975521.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/ac00e6c4b73e97df11448409733cc4d3/paxotoretilariwafir.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/zukataripokanuvirejin.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/caba85102812ee14589cca88735f2924/zubavazivifitit.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/39263194663.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/rp046j6v2cr1cqhcesvmjk7ol6/42134105828.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/12337599480.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=what+was+the+primary+goal+of+the+dawes+act+of+1887+regarding+native+american+indiansPDF 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_off0001195f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13171 16908 bytes
SHA-256: 722becae17345ac5ed2fcd40ab9e913fadcba4f34df7def86e9bd317768efc9c
font_02_sfnt_off00015d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D9E 11636 bytes
SHA-256: cc3b9f39db8c2980ac79c2b960c134dcb73b4b5d306cb0f644df8986361ca893

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