Malicious PDF — malware analysis report

Static analysis result for SHA-256 e29820178936b335…

MALICIOUS

PDF

81.1 KB Created: 2021-09-04 17:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f8431e75c2ec10178cbcaa70f3bceb13 SHA-1: 8916fc62f3a3625ef86adced92820b8ff0f7ad82 SHA-256: e29820178936b335dd6d7925a4584efa5cde5028af2e319a10cf92c2551b209a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting. These links likely serve to redirect users to phishing sites or download further malicious content, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://csom.cz/wp-content/plugins/super-forms/uploads/php/files/74493086f7329faeeb945111a8b502aa/98081539035.pdf In PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/6evo3mpm0cp06qlmulpkp00si2/juruseratuwose.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0e334e4d9---94526830998.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/162562430956572436926.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a12a2e77b8d---kasamitogogitefope.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/22796573998.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/fewezavofikovipazajuvowox.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e766533852e---sawow.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/9214563912.pdfIn PDF document text
    • https://uniontend.com/userfiles/files/17178159156.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083292cd492c---gaguzodinutifigiluvidaga.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/bofesekomagebagat.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7270106fb---69657245636.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111bd8566736---35954063355.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/lfghlqtdr65h4be7979p2taa64/gibinepaborugifoterexogok.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/95545317662.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/wegegepukolafefatozi.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba42b586927---32875679259.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/8d439e820a9f3084eb8b2997241854d3/1825067294.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/ronuximam.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612158670dccb---suzox.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/21144360846.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/52539980878.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/64843d2a4443f27e37608bc80304fd48/gisatotumemetamibafinek.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/tunokutelojatalijas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=use+of+articles+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_off0000da20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA20 17340 bytes
SHA-256: a45566be6b8a94e61da7e1f0e529dee239815483d05539705d13c355063fefb5
font_01_sfnt_off00010711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10711 10516 bytes
SHA-256: 0acc9e57ab473e95f8c62236aa0bbffd866094b9f37f902248d1a66e1605b957
font_02_sfnt_off00011f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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