Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bcf1742fb936878…

MALICIOUS

PDF

78.9 KB Created: 2021-09-06 02:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6abb4e049d89b3cc9ce8840ca44ff22e SHA-1: 30f35fb729eaa18452908e80e3e35874830b4306 SHA-256: 8bcf1742fb93687897e2476132f1075e3a2f6932b47b74ab5a929daaebdb092e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to facilitate phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/kigefaf.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613036cde659e---lufuge.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/maxuzem.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/de54b66d55b60d0368d2768bee75c7bd/lokezaj.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/23910015266.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/90491544419.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c89aa66f0b2---nidalujedefoxa.pdfIn PDF document text
    • https://onlinendttraining.com/files/69187713845.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/86134215393.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/magatozeboselepa.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/36304526298.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/adf6484ccab055ef9dd268f47f68ab99/51850047661.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ki0q70gv2s0rnind7dklmodvor/1245222621.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210610044300.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a348d230105---56017721672.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/tunere.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/dhfvuma7970k50sh4q8msffdeu/nadikofogubolidesiju.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/42223441240.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/2e01a4d2e4c51c9040ae37bd916e7c14/pokewogenuguwekugoromopir.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/tedixikuze.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/movudimafafiponumofan.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/nolojuwavitufeva.pdfIn PDF document text
    • http://sparkpro.lv/content/file/geviginosefeten.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3680ead9a---20407564545.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/webom.pdfIn PDF document text
    • https://melz-feu.ru/upload/dixinu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=manualidades+para+halloween+con+tubos+de+papel+higienicoPDF 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_off0000cb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB63 11112 bytes
SHA-256: 5e1fd2fe0bcb1a346bf944811dd7b6a66651150addc820e5959967c3f5a7edad
font_01_sfnt_off0000e4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D7 18376 bytes
SHA-256: bd3ae2633a925d9d0b3bedfea752e8b1aabe683b7e1d41abaa44e39de3c4d148
font_02_sfnt_off000113b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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