Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f5b37820e65a193…

MALICIOUS

PDF

78.6 KB Created: 2021-06-09 23:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 76d335d0cba0b0be22cbd5799f47c452 SHA-1: b87012c2178de54304adb12419646e296734da4b SHA-256: 8f5b37820e65a193f4664403a9db93b106b0e1861c0df5cbfb302238699c187f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that are likely intended to lead users to phishing sites or download further malware. The document body, though heavily obfuscated, contains references to 'Gta sa lite adreno gpu', suggesting a lure for game-related content to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://huntic.ru/uplcv?utm_term=gta+sa+lite+adreno+gpu PDF link annotation
    • http://hasici-pristroje-eshop.cz/files/file/81701810968.pdfIn PDF document text
    • https://amblamy.ee/upload/file/zaxagurabepewededisis.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/dojapuvodidepenolop.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e48ff6a5d0---junavim.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/gobotujebeso.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1dfee6a5d---57843664813.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/tifuxebubivapene.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/lapivekomuguzuv.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/94077226817.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210520150634155.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ab187c43b9e0b2638cb4208491d982bd/xenabesoxen.pdfIn PDF document text
    • http://hibertek.com/image/files/20210607_094726.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/71649561082.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210603201848.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FE 5156 bytes
SHA-256: 69673a524835794c585bbb64845a9bd0942190ee1f83b60d3db9c3ff6c5e46bd
font_01_sfnt_off0000f897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF897 23244 bytes
SHA-256: a0bafcd12be1597735ad0001ac5e6e6bc9ac8666a80012fed440e60c7977e4a7

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