Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6aaa74f4f6052e5…

MALICIOUS

PDF

71.3 KB Created: 2021-09-26 19:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 396c86e7737f89feb9379578fb4a09da SHA-1: 7a9692de4e53661b3dfb0937e37ff8e3e792c999 SHA-256: d6aaa74f4f6052e5898de9ae2610e0f4e46fd2fa427c974b18e7c888ea5325df
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of 'utm_term=exe+installer+for+android' in one URL suggests a lure for downloading potentially malicious executables.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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=exe+installer+for+android PDF link annotation
    • https://sicurezzaips.it/uploads/file/93906031298.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/16619232137.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db4cbb162e---13176991978.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109160605124235.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6affc3071---30409174379.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/15798409182.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/58292879418.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/42372117986.pdfIn PDF document text
    • http://airmon.hu/images/files/besoponaligabelarewibajep.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a795a6527---9669765033.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/62122339339.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fecf90fbb---1553281924.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/28a79393c3abbb50d8ef4fc6521889ac/50259971282.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/rigudixaxixofida.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/wutobazazujitobubage.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/sodomadakavefudozosufuk.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/54456267747.pdfIn PDF document text
    • http://watch62.ru/files/files/zejojanel.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/dutatemoxumod.pdfIn 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://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_off0000b1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C2 10432 bytes
SHA-256: 31b21840964adb531b5d7062eeae9df72e0501b2f364ee802218018bc6b470eb
font_01_sfnt_off0000c98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98A 18428 bytes
SHA-256: 3872f45c3368d2ec33fd3bc7c410c01c80e0ea42e1ad357aee25a04f1220849b
font_02_sfnt_off0000f799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF799 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1