Malicious PDF — malware analysis report

Static analysis result for SHA-256 e39d7ee3f558d755…

MALICIOUS

PDF

87.3 KB Created: 2021-07-05 00:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 75777895bb8eba5185d796e5d5b3ceaf SHA-1: 17c8c58290f94a666a520571acf5c086f87e55ab SHA-256: e39d7ee3f558d755aef4bd25abba09aa96bc344e1f0cb674f4e57d08c61aa78b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the PDF containing a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. The embedded URLs are likely intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cuatro-pr.org/sites/default/files/file/gozokurozolimasonojosebup.pdf In PDF document text
    • http://afghansolar.com/userfiles/file/zivogokomimutaxomaju.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608075f889273---35973870745.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/5d800c2efe231e6075f38755d508ed1b/5407164111.pdfIn PDF document text
    • https://zold-kommando.hu/files/noxevisaxoz.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/f3e0c487f370f49bf58fb79332430747/gerazinidovido.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba4b201b66---30841481621.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/ecgdcc1klt4cdme1trn41fkhc1/zamusowufo.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/zexulamajoz.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/2uh7bsjjtnfrtel7lu1tdph9cd/setivole.pdfIn PDF document text
    • http://mlkscholarshipsmilwaukee.org/clients/f/f0/f021f13c5c598389be7e913a1ae626ff/File/luzini.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/39604570630.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/b6fa1e378b1d210c5182aea498c34800/67376642140.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609415bb9d045---zufupilekavesufuzaper.pdfIn PDF document text
    • http://cpils.com/userfiles/file/83382161187.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/tagujudazamu.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/0jv48b8c1u39su76394b9uss9t/95495800513.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/8767fa311d7a4e1ce1dabde5f540a8cc/83654174502.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/jawazagotuxowivamilenujan.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608134e70267b---beveloma.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/q0cp5d8se9a36cqqs2sc0j2i0p/gopazozoxonudivi.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/sixonuxukobavoxafemudofoj.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/l3b5duiif06p6udamjfl0hesgj/13597205007.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/kugifubexemizodizonelupel.pdfIn PDF document text
    • http://gyobel.it/public/file/28531969262.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=making+intercession+for+usPDF 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_off0000f13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10950 17848 bytes
SHA-256: 74767ce833593648fedc9de8c73ff69a0ec455d8715823a6ba50509902e9304f
font_02_sfnt_off0001375b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1375B 10652 bytes
SHA-256: 41c3af11cd0a263d95cf8ef351c6d58cc400b4c7ec98f5e31c77d46bf05fdc06

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