Malicious PDF — malware analysis report

Static analysis result for SHA-256 5160b21375e69de1…

MALICIOUS

PDF

105.9 KB Created: 2021-07-04 05:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 37843824e26ea464d8053997c1299264 SHA-1: 94d7082083927ccdfd76e49044ff2163df42f0be SHA-256: 5160b21375e69de1f1bd087cfc8d913cefec5f37269e2d03b05ad425dd60a1d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious link farm designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://drafthe.ru/uplcv?utm_term=places+open+after+12am+near+me PDF link annotation
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/60d90df99d872a80d2ba33fdc6843cb6/16375193173.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/229004be0745ac86c2b7241fddab437c/33652547975.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/bokegolusaguwa.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/45456149631.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/6401062780.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/85657238579.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/5f0e6d1d7afa6cfcfb85c8a733a0dfcb/vodaziviluvivelir.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3314d8284---92700863388.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/nuzanikafinizosuwifot.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/fbd3ef3bb4b4498cb5413a592d984346/82353847103.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db3cdddff9---tisolojimofokanopanenat.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160872d9ac461e---dorusuduzuk.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/ef2d38bf1ffc4994311fcab73c2286cd/vobisapebedijugasivubomu.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/10293613207.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/pims9jo5lu5a8eqi0suifre6r6/31844946301.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/680fc38d5143b806a92fda746ca05a2a/52672816524.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b79da2f16ce---62526423675.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16091043546.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/3i3d7ir0i94pb7jm6iguu2ls35/34800593534.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1625131005.pdfIn PDF document text
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/dekomowix.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/62928537186.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_off00013a68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001527a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1527A 17464 bytes
SHA-256: 7ef7927edf7abfe3ec87e8fe02afe3c1f39c2bd70b9ad0e2893446c378e2d829
font_02_sfnt_off00018048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18048 10720 bytes
SHA-256: 677f70dde58b9e59e2c55f958cb55d373ccb9bf0f2c0ae1692e1d7335ad4f804

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