Malicious PDF — malware analysis report

Static analysis result for SHA-256 625425de27de439d…

MALICIOUS

PDF

81.9 KB Created: 2021-09-03 08:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 10bd7815119c9f1953f938de6dfa0099 SHA-1: edc7fc3cc3ab5a7d907edc89f7757cfb8384cf61 SHA-256: 625425de27de439d1683beddd625ad743b3e4f7467de3fdb07c3184ee068114d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple URLs hosted on potentially compromised websites, which is a common tactic for distributing further malware or conducting phishing campaigns. The presence of numerous PDF links and the use of disposable hosting suggest an attempt to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://radiopoint.cz/userfiles/file/jegosu.pdf In PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/q9tbuorm145k2bkgb8m843hn14/50807434242.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16083b4b12c0c8---74715164496.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/gegakesomulobidukuxoxole.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/43232913937.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/55869759894.pdfIn PDF document text
    • http://ttc-investco.com/img/files/12066327237.pdfIn PDF document text
    • https://atl-50.com/files/file/mujibogopajifejuko.pdfIn PDF document text
    • https://argumentua.com/i/file/13105428226.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/daramoz.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/cgedep6n2jujhd552omkrtuhvs/72053782961.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/70990417051.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/c7f4912441e7f414c863257f9d60720e/18611708537.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/24804135787.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/67343757767.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/78a60d8cc1749274fab41750f431228b/26165870151.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/87871575404.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-8-17/20210817223507875975.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/kuwusezi.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/zamanarapesun.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/46sk9u8qvoq6f25rcahnle27s6/69192313336.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/63910868217.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7ecb6ba91---89100251827.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=operating+system+techmax+pdf+free+downloadPDF 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_off0000d6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B5 18480 bytes
SHA-256: b5276220e7b21b1363081aa3b277c9d8a4489beb4b088d5266b603ac9997f0ee
font_01_sfnt_off000106b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC7 11396 bytes
SHA-256: ae0b0f39762c245accf1580cadb1420284da1db4694e0378400ea4e50c4703f4

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