Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f87123f04fa3e7b…

MALICIOUS

PDF

81.1 KB Created: 2021-09-06 12:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f44f85a10a11eb2c1d70b0e93d1481ee SHA-1: 1c7e25253d533fd914f5412aab6690b8432048ef SHA-256: 0f87123f04fa3e7baa99de68004a3e01fd2c29abd14c3150596829d66f44a43c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the URL patterns are highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://boek.se/bilder_umeny/File/94485244849.pdf In PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/a036ae41b357f9c0611a6fd2a39e1e66/warafotobijevokopim.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/96889416436.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/11855197180.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868170cedae---80188104450.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/rivusizumegifusedukexu.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/28b68ec87b17498815c534a3b942382d/54869690018.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5ddc19de3---nilurapevenoxonatolar.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/rotase.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/18416264459.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c94394c5ab---dukagevuxapog.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5bb0867b3---debogevese.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/1nbcsppvhcf1hmeqahlrkvinh0/47775389110.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/kikutejoxejumetufozatonug.pdfIn PDF document text
    • http://webursitet.org/Files/file/5579120979.pdfIn PDF document text
    • http://phongkhamducphuc.net/images/files/vozer.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/94187799349.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085ca94ddf4e---nefedukipibupemiwonizan.pdfIn PDF document text
    • https://razredna-nastava.net/files/65821127152.pdfIn PDF document text
    • http://aptatravel.com/clients/4/48/489dad2d2d8436d4c085fc0ccdc2d1b3/File/79627421539.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/wixanabuxukupipawasewirum.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/2a7f3b06e112e145d06513e8af85a2e6/vaxesovidif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=mystery+reading+comprehension+passages+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_off0000d469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD469 11128 bytes
SHA-256: 74b238a7cfa4fd60c1662d041e2693a202f4591366b644e28b79ca1bddc0a3c4
font_01_sfnt_off0000ee01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE01 18752 bytes
SHA-256: 37c70dfeeb32e52ee199555f386ed9e280b1b2c481fa80de12c9788063cd14f4
font_02_sfnt_off00011e60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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