Malicious PDF — malware analysis report

Static analysis result for SHA-256 d43a32e10d54d809…

MALICIOUS

PDF

83.7 KB Created: 2021-09-02 16:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: af601faa0c480fc098199833a37a85e7 SHA-1: e8aa2d135846a8dd8a6981bcf1091c86fa720a03 SHA-256: d43a32e10d54d80965a3cb90d2cbddfe3a726ee3cc52c2d6e53804969a085a0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=holden+v8+3+speed+manual+gearbox PDF link annotation
    • http://clinicaveterinariagoitese.it/userfiles/files/25288226609.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a22bee44fb2dfa0c9953b8c890337cb9/gosurepikibaket.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/mjhlnj5820siaoja6vae2pu6v3/79400289422.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/492361e42b6d67e4ed9c8aac08234b9e/wifilujumu.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/52027531660.pdfIn PDF document text
    • https://panama4d.com/contents//files/newufelizowili.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/17275063775.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7dc5b74d6---37246415318.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/24739892703.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/tuluvitaxotesoburivotavax.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/figimanubesepurekexaman.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d47b7d28432---vubit.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/zigojamo.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/i53gu2454r5u0mo5n0b7gcbs10/jazolisuki.pdfIn PDF document text
    • http://betaempire.com/uploads/userfiles/file/file/98387793398.pdfIn PDF document text
    • http://fitviewer.de/files/file/17563554237.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tulinadovunilatekajekipol.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612cff943c8e4---mifevedutetixetonaf.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/nevolepikizemivifoso.pdfIn PDF document text
    • https://ms02bet.com/contents/files/vufiditukolekasenomo.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/xorogumuvamelujupe.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/wanuzavunipuv.pdfIn PDF document text
    • https://mcsfood.com/images/file/ziluvazupijujinunefudif.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/7088698007.pdfIn PDF document text
    • http://standdominica.org/files/files/98499177317.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_off0000e051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE051 11324 bytes
SHA-256: 76649b58f8aff270ea5877444468760287983633f5ef3a2a363576d4f2e09ca7
font_01_sfnt_off0000fa7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7E 18060 bytes
SHA-256: c13f7982dcc011d3fdbdc352d0662d52e050568e52855b1eb41f5007caf7a11e
font_02_sfnt_off0001291d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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