Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6d313cfeb0e7808…

MALICIOUS

PDF

88.0 KB Created: 2021-07-03 15:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 55bf8af8116c91f57c0a36d490b0f6f2 SHA-1: 5788f74bc0a810877b9b2e348aa3f00393e79a1e SHA-256: d6d313cfeb0e78085c2b4ca34b567df93d5331ee1304b8420b0d4df920d26e7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to numerous websites, many of which appear to be compromised WordPress installations or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics strongly suggest the file is intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://irlanc.ru/uplcv?utm_term=reading+day+thoughts PDF link annotation
    • http://lungtransplantopen.com/clients/d/de/de7cc03d42bda6b8b84c8ac9728529bb/File/fedikodizunesabonuwik.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/gumotuwaxevux.pdfIn PDF document text
    • http://adveotec.com/img/file/50563480338.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9545949a08---jelawisu.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/69359821041.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/fe94707be30907c0b785cf087eb794ae/38238589772.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/skvotjlm5mpv1j2npak7gqtp5l/fipefijidagilodogi.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087395aab5b3---vorolarit.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/xazevajejiguza.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb9a892c7cd---19478727509.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/54989173386.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/uc9hch0rkf00gq1adf4kjq3v80/dipemetedojiwaliru.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/dd62e980afc4356e9a130b67bc3ae6bb/68755041050.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/85932077524.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d80a82052d---mazizokitu.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/2r34lhlknimk05fr2abrtcl8dq/4009018220.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/nobaguvoxif.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/lobuxojut.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/59150382439.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609346b1b2d5f---31157336451.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/471f97fc796c240d22822bf0a2ad0719/risororozatalevukovigiva.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/lagikaz.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/88750043651.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/16290d7ee353648313acbc11beac6f14/97118475841.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/95320564386.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/mixuvezalaj.pdfIn PDF document text
    • http://whatdwellswithin.com/file/6894841104.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_off0000f6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C5 16848 bytes
SHA-256: c7403cf3b3944d06f974a4e930a49ab994cf3b1b7841b242c929a7b6a4f66670
font_01_sfnt_off00012275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12275 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A8C 10640 bytes
SHA-256: a1e0e0c1f42801ac587ac2b8f9aae1bfb38297b17b51f11b27287664a836f615

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