Malicious PDF — malware analysis report

Static analysis result for SHA-256 94a4b0b829bfc31e…

MALICIOUS

PDF

99.8 KB Created: 2021-08-08 16:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 5ace17c45609ed40e615e767d1db34da SHA-1: bd76b0e42c936105cd2e86dddfaa72f912e5a9b6 SHA-256: 94a4b0b829bfc31e557053a53cfc0f364efc9f65be49aaf0e01f181a18dddfda
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites 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 distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://schilderlesvakantie.nl/ckfinder/userfiles/files/ketuzewedobiv.pdf In PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16096b7bac21c9---girizekijilivovolom.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/94858250093.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/xapukifekovabaxiderabem.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/sijetudalaxorenozov.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e51c347081---gulavamosogawet.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/e4jbm7peskpb22v1micgo00tik/63656188742.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/saj2matqnacskgs9fq79tds09g/71103351353.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/4lhjk9gh5vbqa0tebdnfp6ui1b/49367682101.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16096b47db06c1---tuxujitupejigibagunawi.pdfIn PDF document text
    • http://efrex.cz/files/file/28733241730.pdfIn PDF document text
    • http://luminex.pl/upload/file/detuf.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1610ea17cbb9ca---gadevebarulepujonunamizew.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1427689afb---vesetubuvidajo.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/14662091456.pdfIn PDF document text
    • https://questyme.com/userfiles/file/14466602399.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aa350190686---88942425568.pdfIn PDF document text
    • http://randalljroutson.com/clients/44711/File/26438105455.pdfIn PDF document text
    • https://service-panev.com/userfiles/zekonubenamufajakuvu.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/5599743333.pdfIn PDF document text
    • http://esistore.de/userfiles/file/gilimonajepodale.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/52549236160.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/28t9aibqj68ds9jfk4u5nb72dp/3670646127.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=appsc+group+1+mains+paper+4+materialPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10840 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12057 10928 bytes
SHA-256: 57b003de03fecaf8cef415516364e44f0cf1da026c1adcc786ef016ca410d880
font_02_sfnt_off000139c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C7 16488 bytes
SHA-256: d0e02ea597b059e12c640018e4c0b859d2fbe31b167f59dc9fd0dc6423c65742
font_03_sfnt_off000150af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150AF 17860 bytes
SHA-256: 20002f57a344302daa012e2d205bead1f7009c8b5daf57c1fc2e6ba0e3281abd

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