Malicious PDF — malware analysis report

Static analysis result for SHA-256 e20094b82b6f9cfd…

MALICIOUS

PDF

82.8 KB Created: 2021-09-18 14:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a0763e10706be57b83b2b85e79c6f8b1 SHA-1: 3641e482d68b6254c7d4c9b39fa482aeebe1616a SHA-256: e20094b82b6f9cfd6eaae67760fef95dc5ee69b98bee210e28f29653b7eb8158
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress uploads and disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers confirm its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://omegapizza.net/uploads/files/vewomogununijusujusapo.pdf In PDF document text
    • https://knoxvilleremembers.com/media/buxesuxarupijapakojo.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/65ac285c832d5e6fd87c2196ae2d2a8d/gilan.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/paridejafa.pdfIn PDF document text
    • http://lemma-studio.pl/userfiles/file/xosefiluxuxolowimojafile.pdfIn PDF document text
    • http://haraj-alqunfudhah.com/userfiles/file/sozokebixepap.pdfIn PDF document text
    • http://byecook.com/ckupload/files/renokuwotijud.pdfIn PDF document text
    • http://husplaza.hu/editor_up/2964808525.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/9829276749.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/25141906712.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/xebaxibazajuvujupebenug.pdfIn PDF document text
    • https://izr.fr/files/50911488906.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/e75a39b65d8605c13ed30d3f0b3bdf4c/fagudiguf.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161381eb6b5400---45026214635.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134e4264bed0---lopiti.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/papunifaxow.pdfIn PDF document text
    • https://csn-alliance.com/data/files/virodivivud.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/79993963799.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/dexudalezobilekoge.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/70445916456.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/gakos.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/30280168579.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd576506b6---57912212788.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406acfc3be2---99229221097.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/29661908307.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/xetexuwevebazudamibi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=excel+basic+functions+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEA 17084 bytes
SHA-256: 979ec4c4aebe8e854f52c0e6095b4a2e1bdcb8dec9f605d4ef1a246d479d7d5d
font_01_sfnt_off00010c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A3 10840 bytes
SHA-256: 412aa3a5f1d23a94d5db64d3e1eb11f9e9e2a1afccf0e223d80f677cfc17f3c7

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