Malicious PDF — malware analysis report

Static analysis result for SHA-256 6806b6e3ff15b2f3…

MALICIOUS

PDF

85.3 KB Created: 2021-06-26 01:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41efe3817006ae263bd5116fc57534e8 SHA-1: 1fcc98f8737c69d9b242df9869d95ae8609b67c1 SHA-256: 6806b6e3ff15b2f311b6391ddef5371b4e4cf9d738025190a8526248273a0889
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting it functions as a link farm to distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b62f218e0---28083213385.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/a5ce9gguqcoi4b1vi0mlfcr1ip/24933027805.pdf
    • https://krassimirtaskov.com/userfiles/files/78365551512.pdf
    • http://hjtech.org/admin/upfile/file/jibobogezujazolesikibajuv.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b52f559764d---10195468842.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/13764e1cae55d5c544ae2a624598de1c/91985614494.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be413a7891a---xobolebajifapirudodokuvin.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb94d3cb41---kafijomixopojifokunefuj.pdf
    • http://qunjl.com/userfiles/files/geluwadukonifen.pdf
    • https://naucharts.com/ckfinder/userfiles/files/9923266446.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a08d3e97459---88400335409.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b1b48e5e0---kodigirez.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acbae55f809---jatimokebafuvobel.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606faa3b66536---xegedefajitudem.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094cbe693eb8---jafataluta.pdf
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/81a56f10626d9ac96f4c076a231810ba/56343238390.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7aa01e0d2bd293ffcc4d6a38104c0b2e/66820086225.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/flm8j311ere529bjvoh3ac0js3/51404864480.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/e85421434fce607ed384377991049fa2/38325288962.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080b2b0b08b3---sopajotakejokodarodosa.pdf
    • http://seoulsquare.com/userfiles/file/bizakiwakuzuk.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc2a38eefc---lumazagalerogofe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=this+love+is+unconditional
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edb4.bin
82fe470a258dbc62c4be5e4a4141fdbc8286df0b2e72bf5b03869f4fa3bad833		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB4 16492 bytes
font_01_sfnt_off00011831.bin
ad41331220b5d1e98a8c2f6131dc2e29b6ebc535c5a945e57ad0c7d8b853622d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11831 10496 bytes
font_02_sfnt_off0001300d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1300D 16792 bytes

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