Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a8d3c87b4912c2c…

MALICIOUS

PDF

95.4 KB Created: 2021-09-05 04:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bd2ef831ce06e24b8e1f80cb8386bf76 SHA-1: 00ee357cb545c88da422c58a24fc0b80b92c48e8 SHA-256: 6a8d3c87b4912c2c4014711158d3a2eb77e4d31d902688c39a901555a0a26b98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or phish for credentials. The embedded URLs and the PDF structure strongly suggest an attack pattern focused on redirecting users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://jdrum-music.com/uploads/ckfiles/files/19159383728.pdf In PDF document text
    • https://tortugafilms.ca/adminfiles/file/65947420181.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/xenujizanumagafeze.pdfIn PDF document text
    • http://www.moyekolodin.com/files/99304002645.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf1f8ab7ed---rewuzibatusikaxijo.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/dasowenozokasoravolumaku.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/kanexitodekaxulabinowob.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1deb460b16---32628204015.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c03d39af64---42084649411.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d4e90e7f8---najiwowan.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bbb4bd53d---jonikuxovidegaganuvu.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873c6580821---41070007586.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/petojerupusibaxokuke.pdfIn PDF document text
    • https://bursac.net/userfiles/file/50187663949.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607be622b5158---69100955036.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/fudofi.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/46dc6004674e86f689bf2f0d851a588b/zujebegurufabidobobu.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b20ad12d66f---bekosavetetulelegujekak.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/fawop.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53a166db98---98683454472.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/66538252243.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129e067d7f5f---riruroseru.pdfIn PDF document text
    • https://sinarwaja.com/account/files/zuraralitamuwaruvadod.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/8657124320.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/61705703559.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=delonghi+pinguino+portable+air+conditioner+user+manualPDF 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_off00010e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E11 17856 bytes
SHA-256: 875329655214b44b6e47fdba9962962d5634dbdbf53d1d1a5825b13a6f16da2b
font_01_sfnt_off00013c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C29 11204 bytes
SHA-256: 978fae4e409c5d738fd5723d671bac869da3b523012a275d709faefc37024d32
font_02_sfnt_off000155be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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