Malicious PDF — malware analysis report

Static analysis result for SHA-256 36ad2ea155c9973c…

MALICIOUS

PDF

76.5 KB Created: 2021-09-03 11:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 60b19b66e48b7b5b573f1ec4c85e4976 SHA-1: a8cc0659e926634ed8edb1c971b96c3632c3aefa SHA-256: 36ad2ea155c9973c7c19b5d296fa0cb64092e675cee257625eabb14bff3cf483
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host malicious content or phishing pages. The presence of numerous external URIs and link farms indicates a strong likelihood of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761bbc0d742---budafisu.pdf In PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/37861043877.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c2213cc3e---3820454597.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/jitufofexozidozemivabigil.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/8b1dfa6654e6bac5bde86e383eee14bf/93727904456.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/76204335891.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/36934760982.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/gimona.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7de51f6f5---66439735630.pdfIn PDF document text
    • https://t2sc.me/userfiles/44411628648.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd74d621f2c---mirito.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086076425fb6---gumag.pdfIn PDF document text
    • https://tl-systems.hu/files/files/72600140836.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/rikgd0s70qj0link7tkc9fkg7f/dosijev.pdfIn PDF document text
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/dojotulo.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b5b2c64431---13866599330.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/vojuja.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/kadepa.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/lotererato.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/52923304525.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c5ae4abe9---vopakeboruxetiwixuw.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/dokozaxeze.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/47528451208.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=first+solar+series+6+installation+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_off0000c671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC671 17808 bytes
SHA-256: f98a4be012f5f7bca9ff76a6d9e2041553ea96b26f70f28ff544dcdea4b85481
font_01_sfnt_off0000f4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC2 10512 bytes
SHA-256: 7cd7705077ccccf6a1272b5e3a17c818f5c1fc4c4d1a740af890eb270a5eb445

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