Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b1bdc9258a20b3…

MALICIOUS

PDF

95.4 KB Created: 2021-08-10 02:18:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ec438d9c5fb395bdf693bf42da5f1f01 SHA-1: 16175bd4560e6cb95eb5a18fbbeb957a0b22676e SHA-256: 16b1bdc9258a20b3f0ce3191a37efe2c3f83c6110a7f60ddc67ef3d8131639ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to exploit users by leading them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://nomylo.ru/uplcv?utm_term=how+to+mount+a+65+inch+tv+on+the+wall PDF link annotation
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929d2268130---87978139956.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/30770029903.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/63550b50bc0d2c994e03a3f44d7e744f/vamixaxelezanomukitus.pdfIn PDF document text
    • https://network-italia.it/file/ragusudazuf.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/306ce5c4c4ec73ed46106fc669ee8e80/51519921015.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/19576574804.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/66535358925.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/4o0miusfdau5rntcuu3tobgks8/56278110179.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/vulamukuw.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b81c3005864---44075878990.pdfIn PDF document text
    • http://someteme.com/archivos/_20210713123315.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/8b14479162c3913a4716dee0a80b3a3e/61060269854.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/koferepigijes.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/37341197271.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c61d6749ee---79078404009.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160abad220cd6a---11591152079.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa12f34a8c---26714163906.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/sejuxuvefinijuxebiz.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/topumaxalazesupoji.pdfIn PDF document text
    • http://standdominica.org/files/files/49926469853.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/m668ar8hdmjgv0ktjm9uv3vvo2/gezurubivogafiwomone.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/48517539327.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/9019654142.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/84774277880.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/gezelajatikap.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_off00010ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF7 10772 bytes
SHA-256: ae9de0769fbae7214ec8d04acc8bbd38f1c8d9f853562cb75b9aa6683c16b04f
font_01_sfnt_off000128a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A6 17132 bytes
SHA-256: 0002844d7f79f0c0d50361d40ad5ff321572fcf1ce7e3187cc87999d0a229650
font_02_sfnt_off000154d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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