Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4fe7e1a0fe89a32…

MALICIOUS

PDF

83.1 KB Created: 2021-09-07 23:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8ca0a19ac46c3ac3d73306c396d697dc SHA-1: fb4da24afda5791cd0c9b7b0591b38612eea34a2 SHA-256: d4fe7e1a0fe89a32b135be1b9e407a19a4ac3369feeb44e8c3cbc76901971fed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The file's structure and URL patterns are consistent with a malicious PDF used to lure victims to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.findvoters.com/userfiles/file/27327229587.pdf In PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/8a0dc50d42c838501558612b7a2ed27e/bevonuvaludobiwofudaz.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/26056192825.pdfIn PDF document text
    • http://mestan.by/images/file/28445612367.pdfIn PDF document text
    • https://eetravel.net/file/jedixatib.pdfIn PDF document text
    • https://luminex.pl/upload/file/3344316409.pdfIn PDF document text
    • http://veribase.com/E/file/62976667132.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/gavuxilaronorisominogone.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/86767075373.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/60393568785.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160f9e748d40e6---36101839845.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/08e4799766b9ca02a61f4636e1ba1762/jekewujajin.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/laxodug.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729b4e8ab01---gewume.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/ravoki.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610283aa33ea6---19329476450.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/penojomaboxa.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/sh77p8afulj1o6nq7454of3mu6/72285649335.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/zuripe.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/voruges.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/pv3akocluep138ff125mlvi26t/16945817048.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/67592602836.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160cdadc09149f---posovezezogo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=steinar+kvale+interview+pdfPDF 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_off0000dc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC48 19404 bytes
SHA-256: bb46e5246058e523a929b3a0bf3e6a1d30a992ea8165508a9147192633f8e437
font_01_sfnt_off00010e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E66 10524 bytes
SHA-256: b386fa95a9de794fa7f411a7713c4bb629166141e39b235606c3494165a54458
font_02_sfnt_off00012688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12688 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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