Malicious PDF — malware analysis report

Static analysis result for SHA-256 807160a736aff613…

MALICIOUS

PDF

70.5 KB Created: 2021-09-05 13:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b4e5d37778afc8e4fd2018eab95b9014 SHA-1: 44e6f0c203d1968673cd072aff4fe8263c14f8a9 SHA-256: 807160a736aff6133c4cbb6e9362e43aa15bd05bf1cfd5efa214d59dd53dda31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://huntic.ru/uplcv?utm_term=curse+words+pdf PDF link annotation
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/2d6831027e4127912eb1977d62478612/gododumemexonijida.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/jefuxobojijupabilipitolo.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/69131400599.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/1s83823eovu10im0g3rig198j0/46069172944.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/3r6rahhoi9mkb3jvr76tv2dk26/16979745349.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/68447284987.pdfIn PDF document text
    • https://whitesal.com/data/images/file/1285_20210603101153.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/fanubojomot.pdfIn PDF document text
    • http://cdio.vn/uploads/userfiles/file/mikivarixo.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/75396730861.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/filapodomewuwa.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/bototodul.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608301fc22018---42242570336.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/velasitakovuki.pdfIn PDF document text
    • http://francisfamilyreunion.net/clients/870293/File/90013444725.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc30aabc01---libibim.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/lepizigekurajopopif.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/5154667256.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/rbvdqndhafqbp3jfaafujt7o70/11520562014.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611b54b225afe---jozufewijiniwumas.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/jipirojabaxawibuk.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9c29b2dac---xomelosa.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160816825e7e2b---21736903180.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/82670448079.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/e532368a2fd5e51fa88a9d937647a25d/xijinosokuzuli.pdfIn PDF document text
    • https://hoongnau.com/upload/files/47671046953.pdfIn PDF document text
    • 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_off0000b62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB62B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3D 15588 bytes
SHA-256: 0465ae9394c518912476010345676d8450dfbd2b4be0fb53104498bf3696d0ca
font_02_sfnt_off0000f5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F4 10208 bytes
SHA-256: b2209e2e875d1eb227b6d9d5ccb93aedd6f1f6ab05c4f5da615a31d0961d9b53

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