Malicious PDF — malware analysis report

Static analysis result for SHA-256 06ed5b37ec3068d6…

MALICIOUS

PDF

83.1 KB Created: 2021-08-19 12:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4be97f1e4f33e9349fe91e0a5d62f6e6 SHA-1: 520acec98f891379ce97713d5cd25fc5294711c4 SHA-256: 06ed5b37ec3068d6e415915219db8459201833ad43749ada5dfd0bb7412ec5cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The file contains a link farm pointing to numerous domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish for information. The presence of external URIs and a link farm indicates a likely intent to redirect the user to malicious sites.

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://elitstroycraft.ru/source/file/87454100573.pdf In PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/o3l7fh2g4bc0s0kj1pp3roufac/89889452268.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/lubepobafakotivozawiser.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/1b26d158c760a8394532288a2b1de883/58021697399.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/mupijuwafabuva.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c3dc09c45---kemovizabekokup.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/279772928.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/1415082fbbd8813940e916161e52e554/32174097388.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/44e6df8663a543927ca9671cbf399769/84466454335.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/shk908nrr1sma369v83alqciou/paberumasorepageguvukor.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/tojexetafutepok.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/wizutabosof.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082761fca90c---87200618318.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c754f17ce91---figewavupa.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb14514120c---41710988342.pdfIn PDF document text
    • http://mfahk.com/upload/files/40640611638.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/23872971298.pdfIn PDF document text
    • http://lagrupacio.cat/file/79262192777.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-28/20210628014955762564.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/godono.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/m4bt6jdf1cegbfkqjfis4obd86/61620505211.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/43322589291.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/7796792732.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/24632776827.pdfIn PDF document text
    • https://senhewood.com/d/files/85612518083.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=o+que+%C3%A9+bolha+imobiliariaPDF 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_off0000dec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D4 18904 bytes
SHA-256: 8032925283908d62afb14992f8c0ae0c9b4234db5dd61cf4dd88e3082a076991
font_02_sfnt_off00012528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12528 10568 bytes
SHA-256: 9ff7e8078e35770efdaa756564c67ca6fe8d0f5c432e20e22d2b8de117b765e6

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