Malicious PDF — malware analysis report

Static analysis result for SHA-256 e85354d828d06ae2…

MALICIOUS

PDF

88.9 KB Created: 2021-09-01 16:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a94e17a5563bfe581cce76c1bfb7b29e SHA-1: ea6566dd495e2082a1f2c3688c3a425f90449813 SHA-256: e85354d828d06ae2abba916215e827ced2524d5be20bf1767af75af7344b3162
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file contains a link farm pointing to numerous compromised WordPress sites and other disposable hosting domains, suggesting it is used to distribute further malicious content or lead users to phishing pages. While no scripts were directly extracted, the nature of the link farm and the presence of PDF-specific heuristics suggest potential exploitation or redirection mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://eva.am/files/ee9755ccc4dc13e0.pdf In PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/fa9826d300b0ead651c1d4690b51c870/jesuvukovikewobapu.pdfIn PDF document text
    • https://ip-pharma.net/data/files/tugirelali.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7mfbtucem3ib5pdm0f8a1cb7r2/lobawarutak.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/3921bb2c6415e6c97959d5760208705c/ditonevetagexi.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8ad6d4bfb---xotokamekosowomabuxedatol.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c32b63984f6---52489101363.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/katikebifiruzudagam.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/mexuwe.pdfIn PDF document text
    • https://area5srl.it/file/fivepu.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/cca111d4b49d2f622aebdb9601e46a2a/tunenogivajabejedugo.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///19286824249.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/69832707709.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd8ad1623d7---16883513479.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/35610483102.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/67150410637.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/2b06a161d2cbf47fd23da19d4322514b/6589311842.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/3cc2de4a586460689345cbe70a24003a/60516229196.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f176eee709---80256247862.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/71287851935.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e8df54634eb---tuxin.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/65390255398.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cd7a1670ff3---kujisej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=clinical+manifestations+of+pericarditisPDF 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_off0000f93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93B 16544 bytes
SHA-256: 8dc48f8bfac96a41f96b8ffb0cc50b02b8c53ddd72471ff35cc6eca4efc2deb0
font_01_sfnt_off0001241a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241A 10812 bytes
SHA-256: 79bd9a4371cb0f9290b3d6619ce5a28ed4ea0261dceb927f0cbeb185f82c9ec0
font_02_sfnt_off00013d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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