Malicious PDF — malware analysis report

Static analysis result for SHA-256 08ba8d647c24ae5b…

MALICIOUS

PDF

98.4 KB Created: 2021-08-06 18:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1b56cd7343b3e131cd31b2f13ffdb93b SHA-1: 35a360fde5a7ac5ff429bcd3b8060fe13d614904 SHA-256: 08ba8d647c24ae5be8d436dbff2601c6dc8757fe740ec70e9f65882ae4b43555
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF link farm heuristics indicates a deliberate attempt to obscure the final destination and potentially distribute malware or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://marleenjansen.nl/images/uploadfiles/79761343708.pdf In PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/a11519e8596bb0cd70d26831e83ed5f9/getokiki.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/6933199088.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/garonutibuzapukumasegup.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4e567d3fa---69421209792.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/2f24968eda0e784f7106ba08c2f7b9e0/davisalowemeti.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160850809043b8---nesunerarikudovidibaj.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c863ae98537---jedetuwodinaxalir.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/m84306rlst9g5p01ekg7p8icfm/tituluvafusogofal.pdfIn PDF document text
    • http://catgarner.com/clients/873270/File/23021565494.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/8248767051.pdfIn PDF document text
    • http://imi.vc/upload/files/60121529601.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/6e724db357b9d77e959fd5debd3ecb6d/jotixafunotutudoberuwu.pdfIn PDF document text
    • http://theultimatemarketingsystem.com/survey/userfiles/files/29154203809.pdfIn PDF document text
    • http://doer-sh.com/Uploadfiles/files/rezesikitedolipov.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/61523648290.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160733b3d144f1---45739892181.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/zabafaxe.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606f22897ca2e---11552603681.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/solipoxusotopuv.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/94034035631.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/1cd1cf4ae9eb573e9513873abbf9d0b6/35873685539.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/34890547171.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+manage+your+time+in+high+schoolPDF 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_off00011d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D02 17060 bytes
SHA-256: 58d27328743fa79a36e89f0e3257a5df18f7561e97c5387b5f733d726b6b6817
font_01_sfnt_off000149a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149A0 10968 bytes
SHA-256: 8c761ddc64ece738a9cc7a0935a072fcd389fff91ca21961f102002b4f0aa164
font_02_sfnt_off000162ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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