Malicious PDF — malware analysis report

Static analysis result for SHA-256 91fc2d964fb6c90e…

MALICIOUS

PDF

91.3 KB Created: 2021-07-05 13:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 564ae850120c7bfec5df887bb01117be SHA-1: fafd2fbeadda7ce6617c5171883be5def9ea0ced SHA-256: 91fc2d964fb6c90e5dc2a101f67947f9c6fea2dc3d1bf1928fad98eab0e7c9d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://inwebjor.ru/uplcv?utm_term=stewart%27s+clinical+removable+partial+prosthodontics+pdf PDF link annotation
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911ced79d3c---4522404843.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/44d2cdf49da55413d8ae9941f88403dd/20269771339.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/lixuralegedoti.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1623871040793778450.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608031991d5e6---mejinegiwatesuzem.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/posijukogisatibelek.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a415e778438---jekepinazojebenufileziku.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/55968354937.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/2210a8a33876a2ad7b7269e4a4e2409a/zenolix.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/63722541299.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/9dkttl049lenhv49msc2bkgbo0/zipaxifemotowal.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/db994c0b2a84370d2123ec6550166f4c/mosaguba.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1e47c42a9---52403217804.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160da0d521f764---jawosupopuzabesizes.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e7fa981be---7029855161.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607658ac56406---58424192690.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/90d8bbd6eb646bec2cdb0cd96b45e331/72620317915.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afdfcaf246---69644848091.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/pemaxexijevofapabimulete.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/639c5f192f8f37c95d6ad34ab7619838/97118192752.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708f5e4d646---61622324992.pdfIn PDF document text
    • https://promise-land.com/upload/file/zoxobonutadaxizale.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/9a63f7b047b3dde582f84df355920a86/32680743474.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/tabolajubasoko.pdfIn PDF document text
    • http://headrepublic.pl/images/files/96518861965.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/razelipodajipusejob.pdfIn PDF document text
    • 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
stream_003_off0000f06d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF06D 24816 bytes
SHA-256: 7fdea785db766edaa7c6b2d718e62cef5b195deabc25571651eb0991dde3d038
font_00_sfnt_off0000d64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64F 11288 bytes
SHA-256: 1cdfc9de18d29d447cfbfab88bb5c21141a30eafba497975c2c0ca705a50347b
font_02_sfnt_off00011ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000133b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B2 16616 bytes
SHA-256: 8a7bbfd1fd23a8eb2abac22a2b700f4236c1d8e8454676296e7621518f5ef489

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