Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fc5706f8d592a64…

MALICIOUS

PDF

134.3 KB Created: 2021-07-04 23:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5c36d3f3d64d39b781cb462604a5eb4d SHA-1: 78c711df65626c27a3ea6d678668810b746b9059 SHA-256: 9fc5706f8d592a6447557d7fdf0416aa92ab545dea7df5341fba24240d113968
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9792

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://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16087cffb5d8a9---87718280945.pdf In PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ce545c8ed---56591854215.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16085ee4a1a8ef---16825787868.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/0520ea8f489373da150a50c2fb42be01/vozawemosexo.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/5p9otpcb9e7n3chcums6vs8ea9/bowolopumaleminoxo.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/5fc61d6134f676df0a52e31c39daea90/76840256897.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/24199340008.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/mprqpsfvnljmqog6d9arpl150s/kusavesujafuzubafufe.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/ilc297a9g51gtfbn91kk5aqb7f/20566977070.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a3d172370---voxemekam.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cdb1e52bc34---wanemubebefepolobojudum.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/manofenofulupebuzorafuxu.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/zuwolofomebijazige.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f7f6979ec1859c5fa1112d3d62cddb09/86476572270.pdfIn PDF document text
    • http://ypcalumni.com/clients/2/24/24042806289e0d450134266962f0a0d8/File/51857199167.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/e79dff412315608f7c6a1898a83cedce/vomikani.pdfIn PDF document text
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/rewulamet.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ded536737e---66842296789.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/6cevqr3227936b32fvldj4vco0/50274469241.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/7edc2019ea5cc3430546e36592907ac5/juxataxovo.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/12ec1efa9e67c9ce475bd0c7294b9111/62040034561.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/9f2d9e965f6137343de98422efead5fd/80205241089.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/5i494p3de2n87kdjrj4098fdm0/virowosu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=solution+of+electrochemistry+class+12PDF 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_off000191e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191E1 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_01_sfnt_off0001a716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A716 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001bf28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF28 18824 bytes
SHA-256: e9c82deeac40fcc7787177de480db57923da5458370499116a14b137c2ed61e4
font_03_sfnt_off0001f146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F146 11064 bytes
SHA-256: 787937e0d2e3604c73876c31c02c35c8f8b92e4b1174db6a5d7867cf9524efdd

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