Malicious PDF — malware analysis report

Static analysis result for SHA-256 f940f5d3878199cf…

MALICIOUS

PDF

78.7 KB Created: 2021-07-09 07:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 650d0c701204b05533235af0a5f816df SHA-1: bdc02821d19ec1d20a5a1b6ffe8c4c1b8e5ef7c2 SHA-256: f940f5d3878199cf3a37175b352ba94574f5dee63d1910330ab56199811d1623
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://anysoldierfundraiser.com/clients/a/af/af293656121fcb8b60a8c910089dd81c/File/81204668795.pdf In PDF document text
    • http://musorcentrum.hu/files/article/file/tuzenakizumoradix.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/9f2d79d7d7c440c02d3504a8f6043de6/27891374459.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e65a86ba800---59434101018.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/narigadobimud.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/36582574457.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/lodimelebut.pdfIn PDF document text
    • https://abeess.com/userfiles/file/fisajubudosafidajalisizif.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/26812127097.pdfIn PDF document text
    • https://bliznacite.com/files/xasarome.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/vodimolazunizubowa.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/xolanuwijuluxoponofigifin.pdfIn PDF document text
    • https://ancoraeducacion.com/images/fuzesojodugesalubebeg.pdfIn PDF document text
    • http://liddellgaryfamily.com/clients/863293/File/batisudobawiwa.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/53444409979.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/ds3rflsfe04vsc3a6e5h7kvem3/97181810079.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/zakebejejuzupizexosepip.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cde738e711---wemisepexuw.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b6b362328---67117200991.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/8ij88k2ic6cicuib6k846eih3f/pufilivowibotojorudoxix.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/95095257354.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608315b33a285---rakavonamixibuwuwuzeka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=second+conditional+travelPDF 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_off0000d158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD158 17120 bytes
SHA-256: be86a5633a96e77bf03b9cf4cce8dfcaeaf0b460a31cb59be2c6307c9f2268ed
font_01_sfnt_off0000fdfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11614 10336 bytes
SHA-256: 2af2ba222dad6d5aadbe5db34e3beb9f6f70b9283975fd6c78e25c8bafdb70f7

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