Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16da4c309827b13…

MALICIOUS

PDF

68.4 KB Created: 2021-09-13 17:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f30f31b1c0038a9b6d379baf35ed00f6 SHA-1: 6dff867c24df3f66bd17fe9ab8672a239dbb35a1 SHA-256: d16da4c309827b13d78ba832c1e1a98576ffa1a0c495a440352d4ffbfa301f5d
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest the document's purpose is to redirect users to malicious or phishing sites, potentially for malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://cructi.ru/uplcv?utm_term=android+to+ios+converter+free+download PDF link annotation
    • https://fleseriuassociates.ro/files/file/jiforidupurepajuxe.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/xivelegevawuxegumasalago.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/41484709941.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/36180462644.pdfIn PDF document text
    • http://traviet36.com/upload/files/fuvikox.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/17001d86bdd1f07f07a72bfc3ee5ddf5/16483315330.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/zuzerujoxivixegejonosa.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210913180724.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/96673257776.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/tadofemov.pdfIn PDF document text
    • https://robodom.si/files_vsebine/84423680187.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/6099087672.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4d4b06109---mudofonipiwadumifo.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/mamodigepe.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/52092611955.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/47953758492.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/32426086834.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/lekujobifup.pdfIn PDF document text
    • http://erex.hu/upload/file/buxasob.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/pjqcn9ru8kioa98003tj7s00bk/57257246740.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/jajapokomagegosadawit.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/20205138854.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/93837596560.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/91523526561.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_off0000afa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA3 14216 bytes
SHA-256: 8d82927589289305ac039d7f4c37d4a10e69475ae742a7a5e2e699b20a9d0746
font_01_sfnt_off0000d332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD332 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB49 10600 bytes
SHA-256: 4e799bebd7ea1bfce4e9f04bcd91ee0c7c31edfc26ebd7eb8c8263d63261cdf8

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