Malicious PDF — malware analysis report

Static analysis result for SHA-256 fccaae5759bc0e3b…

MALICIOUS

PDF

73.2 KB Created: 2021-08-28 03:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6296b6ee7b0cab1d8d11ddc79f4cbbc3 SHA-1: 7f6b2e6561dd260b69ac96415dd5b575a2c57139 SHA-256: fccaae5759bc0e3b2b413150be9749519bffb72dc873a97c7abe171f4aed03b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains a large number of embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the presence of numerous external URIs and the overall detection profile indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://inwebjor.ru/uplcv?utm_term=gallager+stochastic+processes PDF link annotation
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48957982583.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/nosemijotabejiz.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/23295109500.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/343st5uf4lm1ltrcabu2tm8cpv/metubakidupatet.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846b573e96a---nuweno.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/xuvonarobapisawekumopudo.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/nugirenoniraw.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f073e1ba54c---zetegejamozogobudutabu.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082fde87899f---zaviri.pdfIn PDF document text
    • https://abeess.com/userfiles/file/55191908526.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/79c7c5205bc1709a704a684ec66a8fc6/87248671916.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/17324027935.pdfIn PDF document text
    • http://rapet.hu/files/xetusibobemuvirege.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/dec5112a4f80e0a3cdb1864618c732b8/91487192353.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c6a0f373e2---muxojiregipifiwemuzap.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/fipefamodobolosewaj.pdfIn PDF document text
    • http://fittbikese.hu/files/file/gafedarerojog.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/60450134525.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/54838666842.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8055333c90---zopotazuxug.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/92716533796.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_off0000bb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD326 16676 bytes
SHA-256: f66ce965ec6ab9df698a9feb5b9f7b17ea567fc3a8dea2fa19042c7490223d64
font_02_sfnt_off0000fe1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1D 10588 bytes
SHA-256: f01b1b83b0fe6746f96bbd92d67b9f1fc45ee18b469eff8ad79c195bbda799d5

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