Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb26e499d1073e0c…

MALICIOUS

PDF

92.4 KB Created: 2021-07-30 19:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 9c23b5cff9f065dbbc28f403834af8ad SHA-1: 3018acde04a11897e88cba54f3b82e1df2c518da SHA-256: fb26e499d1073e0c0a92cc28162e803b6775cf21cbfc09e4bb6df0dbea161480
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and embedded URLs suggest an attempt to direct users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 5

  • 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://comp-art.ru/userfiles/file/sisiwunuwopufilep.pdf In PDF document text
    • http://capri.lt/userfiles/files/fasuzevabajek.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b370f14b961---pujaduwuzekoxulevatib.pdfIn PDF document text
    • http://princeton1959.com/clients/863834/File/zurokizewunafipi.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/jusopajavusitikabototipe.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a336773dc68---gimuvoropitu.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/vigijagelato.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b708727340---12823627112.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/tetadibizoda.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609e98e4d2940---tabatudig.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/81921126106.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/5908614739.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/cemclvtlsct5fa1jr51a8128i4/96195598482.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/41577988989.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160deb5d455c2e---71906097760.pdfIn PDF document text
    • http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/fafebowa.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/zafojunilerikorojiwexu.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/larupezewexalokovanag.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608535aae767a---79934901029.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e00269bc140---22612055109.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/ptf29nd2itpca3e89j1cei8ee3/goguliwufiwizumuburoj.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/dce109463fd032150b3fc7076d2bbe9e/vogokabotajafofafuza.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acf15752431---88884809047.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/5fa12e4aa2765753f6a2af68a2b429ca/61943005470.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+hack+money+on+virtual+families+2PDF link annotation
    • 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_off00010a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A93 17852 bytes
SHA-256: 3c79012d8ed4c287d8990eec478a36626265bc0977c50a9e64e7d30d1b866eeb
font_01_sfnt_off00013889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13889 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000150a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150A0 11172 bytes
SHA-256: b7cc92ef16d9ea467d40a8066ace089a9682c68ecd5b20ff5fbd01f068c6f537