Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f27e800ba5e4f7…

MALICIOUS

PDF

75.6 KB Created: 2021-09-02 08:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 38ae4642d0d215f7a50d6864e5ff90a8 SHA-1: 582d152fb1602facc35c1eae0af778a80e424537 SHA-256: 87f27e800ba5e4f70afacd7e44f45338429d276fb6e600bb6711292f509f6be9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://s-privod.ru/userfiles/file/72101507941.pdf In PDF document text
    • http://ohappy.org/userData/board/file/gebemarenasokizafuvenajet.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b00f46d0787---kusix.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e232b6071---5586986534.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/40719729045.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/69626768127.pdfIn PDF document text
    • http://c-six.it/userfiles/files/kowatubiwonitere.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/sudiputuzivajepikupozipev.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/21272897207.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06790de1a6---15566070772.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/xelijezowefopesasido.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/9b5d81e807a907036956b97faf376e7c/15346390700.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/5829519225.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f26c68393---95391329363.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4e3446bc7---25576438001.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/72097135488.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/68437146068.pdfIn PDF document text
    • http://winso.tw/userfiles/file/71841167494.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/35958161669.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/fajuleworufozojixu.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/babexepajeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=date+a+live+all+episodes+listPDF 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_off0000bd3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54F 20260 bytes
SHA-256: ac32d050d65b251e36d7a81fd167271e9e9511bff79f2fd4cf544131793810b7
font_02_sfnt_off000109f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F3 10248 bytes
SHA-256: ce795fbc3b04cfeb6bbc4b6dc2cc3ba8e952b6f5375a36d88200d1d1f8879d25

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