Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c97081c4b507282…

MALICIOUS

PDF

93.4 KB Created: 2021-08-16 10:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a129c85dfa7df24cec9fe065f1b2e6f3 SHA-1: 1d6238743fea7048e1850a2a06a28df3ef896496 SHA-256: 9c97081c4b50728213012d7cac1bc1448c78434b2e077c89cae78c42d73250a5
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it's designed to obscure its true purpose, which is likely to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/66e69e3c7a2c78e4f1c55eb76f421166/28628700140.pdf In PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/kotb5tspmhtre7fau1an0n017r/wutewisavekurerovulimi.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/jonofezixaganopifokiwaga.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/8b116c985bcf8e5584720afb4a5ba34e/kaziraxipubaxapemijugirig.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/b491dc78e86b7588f7eb1af2eacfaa63/43325492716.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d41fa701a2---mabik.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/lufesuwusabubap.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/mosom.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/xekilinobakom.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160756ce3efc4d---digupiwosariwozezusaroze.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/piwelo.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e1a0735cded---7423866340.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/vbukbebvc60m8dap8d30teesvh/mogatirelovarevex.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/281a2ab4867135ca198f9d72e3c988ed/zikileluxupi.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076e9066f52d---95946538786.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/muxutovajupetawu.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3d10dec83---98947915580.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc029b64e9---40057172528.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608702596af7a---77693628666.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/dowumag.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/kusokajupumuxoxasavo.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f70eef92af2---27221132745.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=football+manager+2019+database+2020PDF 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_off00010823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10823 17272 bytes
SHA-256: 7ca02bf545d1a717eb8a10b9c76286154d682519aceb006406093f47cdce7318
font_01_sfnt_off00013571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13571 11076 bytes
SHA-256: 1eee73c11d3528fd2f387cca441a7d9419fee950c29aed4b13eca79fa49d51c7
font_02_sfnt_off00014f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.