Malicious PDF — malware analysis report

Static analysis result for SHA-256 58d12f436fde23b6…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 17:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8f8520146aa3d2208b4bee20d48c18ab SHA-1: d9ead8c75dfa2a112d8e08ab916ceaaf13906a22 SHA-256: 58d12f436fde23b6fcc6426b876e9b6b789b56633cbc0193c8371b7256be12e7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The primary function seems to be acting as a link farm, likely to distribute phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://catamma.ru/uplcv?utm_term=wr3d+2k19+mod+download+apk PDF link annotation
    • http://resortvillairene.it/userfiles/files/64030952274.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/56950106181.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/9t9u5lmnupato1usjr4omp4j5o/76295386552.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/26a65utfvf33f24g936ml0n4q7/42219355436.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/64311871264.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/40317192068.pdfIn PDF document text
    • https://ms01bet.com/contents/files/kibemejavugufuwudipetula.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/88069399769.pdfIn PDF document text
    • http://fkhd.cz/data/img/50328517741.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5b2fdca1f---woridazutusaro.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613057d9d46fc---xojegimomomunaxozosokifi.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021091221335573499.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/60080992057.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/gediwadisitoranuzenu.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/zagusaxagafebezazokeniz.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/oah8r53etn9b0eaoj8apnmeek4/zafigebop.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/33077632883.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/gexusezusurana.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/tipilabuj.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161375c711109b---nixukukakakiwasov.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/todirix.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/duzosorirabozudowakez.pdfIn PDF document text
    • http://linza-market.ru/upload/files/69052315935.pdfIn PDF document text
    • http://herve-coiffure.ci/files/weponemalazola.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_off0000d6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AE 10744 bytes
SHA-256: c9eabd6051d817012a4e1286af9cff5145b44a346503cceb4fa6c6fd8e2b3881
font_01_sfnt_off0000ef79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF79 17256 bytes
SHA-256: c73e1baed8692482526d4ab98d45f103df6f11bc7409b60a5f3cd2047398f2ae
font_02_sfnt_off00011c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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