Malicious PDF — malware analysis report

Static analysis result for SHA-256 af199d4fc8221b03…

MALICIOUS

PDF

152.4 KB Created: 2021-08-16 07:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 18573842673b017e138dc8bde630c633 SHA-1: d3005922f73a95b68de82f473c3c60cad9ad20bd SHA-256: af199d4fc8221b030d2fde5192ebd919826906f24b894aafa8ff4dc18f828090
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. Although no scripts were directly extracted, the PDF structure and URL patterns suggest it functions as a link farm designed to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/50ec45eaa56825548fd68cbd7d33f3df/lukiruxekaxet.pdf In PDF document text
    • https://kompaspt1.com/contents//files/22669091744.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e66a75834d1---99634680984.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/doruzi.pdfIn PDF document text
    • http://dzbnf.com/upload/file///5529291644.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/vatovuxuxulidaju.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-7-6/20210706085652708053.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/51501966808.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/97683e188949e6b92690977b101e4b2b/648836345.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b30c38a6fd2---jesinunejatufivub.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/84gccck7g1muktseh746fgmhc5/62326848241.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/2b075e44e15a4d839192dd55e801742f/16060865756.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/wumilosegafewowen.pdfIn PDF document text
    • https://noblacklist.pro/web/img/podborky/files/malaxelabenapunawuw.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/80341752071.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/81030312051.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/fetaluviwotebepenajixipiw.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16090f073521cd---48681571844.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/96417894489.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=cartoon+wars+3+hack+iosPDF link annotation
    • http://irodori.kir.jp/files/file/86336862960.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_off0001f2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F2CE 10528 bytes
SHA-256: 3c171a9eced3a7fb1fbd253a65b329793b95e021e816f3ef9a66d0da9a772678
font_01_sfnt_off00020ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20AD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000222eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x222EB 18184 bytes
SHA-256: 3258e18fe6e23b8567334d62c0d1715d66ad2adfb2eec8bf8770f050ca97c23a