Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa1a2d64266fdb7…

MALICIOUS

PDF

99.6 KB Created: 2021-06-26 21:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 59f5a17103321cee5e903817cd8b4056 SHA-1: 4af7f8625b6a1d56380873dc598c721b6cf9937a SHA-256: 8fa1a2d64266fdb7f7b2dc265e8529057f2851c28a20ef6fc9faa84b8a50cad1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cf8b15ab3---70248917400.pdf In PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886efebbd41---nepotovige.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/sowuse.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/nafopitijixuxijumevibop.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd9af1e9db---71585412217.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210627003112.pdfIn PDF document text
    • http://qachs88.com/clients/58271/File/rupuwejijabifem.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/linetanalagoluwizix.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf3cbb91d0---95829623431.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/42579349732.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607c110b7529a---57874883825.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/7fcunkpp6kium656ucaubd4640/43005189800.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607b79a265de4---wajazume.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a5efa490d1b---gujumerukew.pdfIn PDF document text
    • http://askort.pl/Upload/file/lajonigufozoxividoluz.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/likipuk.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/saxuxowijuluwivuvo.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/82270761192.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094d90c7a7e5---bobekoxokufizexineravo.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/fd2eb239f43676ebf2b9c3caae65d17b/88205203160.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/barudalaliduxuwuvuwid.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/46444986315.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210513171256.pdfIn PDF document text
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/1fde79c09623c4f90f8c570beff7f133/53859536134.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=verb+beginning+with+hPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12849 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001405b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1405B 16404 bytes
SHA-256: 61bfe58aab4fec31123c681539ae71a8d800e75c29fca433508b6a40bc7d3490
font_02_sfnt_off00016ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AC9 10088 bytes
SHA-256: 6485ba55ee59a03dd66bfacfd9ebba5c89f53a451d98fd063aaf2683eac8bf5e

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