Malicious PDF — malware analysis report

Static analysis result for SHA-256 75f8a693c547553c…

MALICIOUS

PDF

91.8 KB Created: 2021-07-14 10:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 92ce955e4e9d0f7db304462d33560063 SHA-1: 60f7bd5533efc1f884693c7bc4a2390596b74ac1 SHA-256: 75f8a693c547553ccc971782043c46d80141a4e0f8fac6a9dd78b2e058cec3ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm or phishing lure. The presence of external URIs and the nature of the heuristics indicate that this PDF is likely intended to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://drafthe.ru/uplcv?utm_term=get+your+ish+together PDF link annotation
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/a56107d86cf82127b32fc8ed66108e64/buzojejademenazaji.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/93068486235.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/jukozir.pdfIn PDF document text
    • http://prestizhstroycompany.ru/SITE/files/editor/file/1781595520.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210706_180405.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8676c0702---dugegufipu.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e332c93afa2---norufetu.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160940f6fc0182---defonewukibuxuler.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/nadesaturevuwopadaretu.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071796a173ab---purebo.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/da67fa6eda9619d2fa7e44af4aa688d7/gefirifofomugalu.pdfIn PDF document text
    • https://mimpishiodua.com/contents//files/bixumexetonobosomolujiver.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/begesawetezorovabazit.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/lasegeg.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16080998dabb6f---23389044451.pdfIn PDF document text
    • http://minhvuongthuphap.com/upload/ck/files/kafatomejedofurazegus.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/somusobavelizidok.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/kasalemexotoxi.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607892f576942---80220753754.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/57110148934.pdfIn PDF document text
    • 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_off0001039b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039B 10328 bytes
SHA-256: f3df03f8851bc7434a7f77535ec546cc72ed1ce93d62dd04885449b304222a9e
font_01_sfnt_off00011b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13337 18120 bytes
SHA-256: 0a438628f2d0455f81b39251f51ba5701c0d2cbb6c38dd6187f6cf2d0297a9fc

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