Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cbcf77f2bebaf6f…

MALICIOUS

PDF

92.6 KB Created: 2021-07-16 06:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d481027f53c0fa6dc98d2e470d76daba SHA-1: b34bc79fd0fb64039da6be17e3c73a75b5bc2d18 SHA-256: 8cbcf77f2bebaf6f31c20e31bf4eee8b517c2e2bcce179b0fabc31d617889c0b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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://vinmexindia.com/uploads/79996225595.pdf In PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef4a310f72---84825476388.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/57156560695.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/80918614345.pdfIn PDF document text
    • http://iphysiology.ru/upload/koluzovozebadononusurep.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bd0cd3dea---tokef.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/gijoxurazapen.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/71966428424.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16094dab260eec---vilumokarenuvobelozagujuk.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/feteziwedefoxovuxa.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/6725352242.pdfIn PDF document text
    • http://beateromer.com/bilder/file/40443133033.pdfIn PDF document text
    • http://envigest.cz/upload/file/71039618990.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607afe2be3280---44534381576.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/57998868826.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/7nqrt27vaoub2vnlfurgbdbdke/77026828556.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/rujexufupurebotukaj.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/42870024018.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/3e5e0899b3ab17ee24581da9a45c097b/30724096457.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/9op59c5d5k3l3uj1gpgsel0vjf/gulof.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-13/20210513040716217808.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/5588864368.pdfIn PDF document text
    • http://beachhigh65.com/clients/879402/File/tefamiwinapu.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16088799835c8e---mapugazuwifafarodefores.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/jijexavafivawupuno.pdfIn PDF document text
    • http://ccsl.asia/files/kexizemotizezatipuros.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=simile+for+something+difficultPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10583 10936 bytes
SHA-256: fdb44b4193373672ee7160310ac042ff556ed1c5c17e2c749f6c61e24d2fb76b
font_02_sfnt_off00011e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E69 17664 bytes
SHA-256: a2cfc4db923002fc03eee7bbf329de474afa6e8ae3bbb1fd97011b745309da1f
font_03_sfnt_off00014cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CEF 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4

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