Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b75d67b48363087…

MALICIOUS

PDF

98.4 KB Created: 2021-06-30 12:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e1c3fec06492b96ae0091cad8533c7d0 SHA-1: 591e4e0a27431655081a4d2e5f1d569e0b1a048a SHA-256: 2b75d67b48363087f02d2010da420ff719e3ee341a35de91f716fd0efea077e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the analysis relies on the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/apdjo08pu6r4kv4cj55008iukd/45414557423.pdf In PDF document text
    • http://msslink.ru/userfiles/files/66916627359.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/65ac2ab23fe5c60a3a4f923afd9779f8/rozuxisekaxir.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9e6c464e7---jezuvoxikesisadogelezi.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085afa359ae3---murusideni.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60CB3BEF56B75.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/13452100488.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/budigabilugebewugofojakal.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/1f5ed0b520d5cddb0d6cf870e58282fc/80071644206.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca68111fbe---purasofedafusuzoke.pdfIn PDF document text
    • http://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/winepirulumogon.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/97907796518.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4daba07af---mipetozidisukaweduvutijas.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/tqm107do1gpban4p0b3atguk26/23487327489.pdfIn PDF document text
    • https://nhadatonline24h.com/Images_upload/files/57356568990.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cb6275708d8---serotefe.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/38572683178.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/f0cad57cff3f19d03e46b2f42c49dc9b/zujujipuxerogimel.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609801c88742b---68972359215.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/f0857a6918d8e21af1fdb433e3beeb3b/zimutev.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/35765008875.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/9c0d8c1ca1afdfc55e8502510e28a4e1/vesipekebibakupetulu.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/b5c6322eb4d7983a7b131e1690426c09/84861312709.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=holy+mother+pdfPDF 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_off00011059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11059 2656 bytes
SHA-256: d33711eb5c2f0522ffdce469f64ac87e217d669948117922d401911b3cceacd8
font_01_sfnt_off00011bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133EA 10344 bytes
SHA-256: 73b7fcf132388ba9c894e85c33b3ef3688ec4f1ee858d0eda20b2a8c5a95df09
font_03_sfnt_off00014b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B34 18248 bytes
SHA-256: f7a46d45ea522185c48bb24667923b6ba0aae396fc7a4e6ee12bff7480d7151b

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