Malicious PDF — malware analysis report

Static analysis result for SHA-256 852547beb5db2df2…

MALICIOUS

PDF

85.1 KB Created: 2021-07-12 23:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cbf64211ba1152703699afabd1d87e58 SHA-1: b259bd8364d64ca80e7debbf21603d63c88bf628 SHA-256: 852547beb5db2df2a361a0bcf3e6d5cca8140ecca8c6deec232d63f9f36187b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites used for hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the structure and URL patterns suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/d8a905e2881c04f08427e99983349136/tutun.pdf
    • http://www.tokyomagic.jp/images/library/File/1017611406.pdf
    • https://swagath.co/new/ckfinder/userfiles/files/tebumepifosef.pdf
    • http://tms-operation.com/upload/files/zokorunowotu.pdf
    • http://etre-belle.su/images/file/99276034432.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084d506d4b34---32134578097.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/2kk2cbno4nesv9ol5c3saa6is6/zidakoganotaru.pdf
    • https://soalmatematik.com/userfiles/file/natesulawozalotepekupowon.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160863197c95e5---4009226994.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/a2i41j3t6csftjbh0h4n3s01v2/43856649354.pdf
    • http://salukool.ee/upload/userfiles/file/34100858668.pdf
    • http://polyacer-ecp.com/userfiles/files/20210625_105606.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/f91f0f04f7cd7b87a7820d2378ab340f/gerobaluvil.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/6b854c5385332c20f261fee6c6b694fc/posoda.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/4205a8a41438ccbd2dd07c61608a9df5/mugisogusonorabajed.pdf
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/2eacbe069488f31ff0902380025c7fa5/29232501039.pdf
    • https://firsatoyun.com/calisma2/files/uploads/50044992057.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/3e3bd4be375fecf2f121dab2016433bc/42429985388.pdf
    • http://angeladaniel.eu/uploads/files/lizepumateralapajekogot.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/33f65fd542a5baf949ab1324eab235ca/koroxexi.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/ffa90c22949ff10b913fd3f0aea5bf28/beteva.pdf
    • http://locoffice.ru/userfiles/file/mapenaberemiz.pdf
    • http://vom-ragnaroek.de/uploads/file/35522898610.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3e918c21ea9b6b3caae3d826838933bb/44923603849.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=types+of+aerobic+exercise
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea09.bin
98855b03f740f1f929869cb6a3be5bba893111f213c5d1701755401f16171a49
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA09 17216 bytes
font_01_sfnt_off0001173a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1173A 16792 bytes
font_02_sfnt_off00012f51.bin
8a5a74b3422f68a252adb9b2e028ffd7499430bb34bb0db8a96a5f4dd814b980
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F51 10544 bytes