Malicious PDF — malware analysis report

Static analysis result for SHA-256 5187b0d6fb4231b1…

MALICIOUS

PDF

86.8 KB Created: 2021-09-09 12:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ede28bf06b6850e4f82086b86fe19795 SHA-1: f13e544edfd7efca4b2dddb3f5cca21bcda7f008 SHA-256: 5187b0d6fb4231b1cf63828dbcdcc48e6a007c5d721b7f494cd22916e45cc5aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and link farm heuristic point towards an attempt to exploit user interaction via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://diplomat2014.ru/ckfinder/userfiles/files/wozapora.pdf
    • http://daglichtfilters.nl/ckfinder/userfiles/files/vunemiro.pdf
    • http://alituncer.net/userfiles/file/ririkugurinevigop.pdf
    • http://unibox.lv/files/text/lemaxur.pdf
    • http://www.facyt.com.ar/ckfinder/userfiles/files/36623218880.pdf
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/guzug.pdf
    • https://arhometutor.com/userfiles/file/fewuxotinodisugujagane.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/5d19210iqsadlkbn8ovtnkk5qr/tatamexozixasumowaxowago.pdf
    • https://trimix.bg/UserFiles/File/29485297841.pdf
    • https://blugarden.eu/file/totujokodegabadimefal.pdf
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/63165826484.pdf
    • http://homeopathyhongkong.cn/files/jajatapisejeninufegoboje.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/3rbkhtgkb3mn8ept8f3i82mq6p/kedapovodisisuze.pdf
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/28810618027.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351ecbae31e---jaxuwanafegedakiluruxomo.pdf
    • https://akonis.ch/userfiles/files/dubiz.pdf
    • http://trubaopt.ru/content/file/xoletelejozeredevano.pdf
    • http://studiotecnicoforace.eu/userfiles/files/nizodesifirumazimoli.pdf
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/mukagelaxetuj.pdf
    • http://nyett.hk/uploads/news/files/domenevalor.pdf
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/xometexurewubigapigoteso.pdf
    • http://movesearchesuk.com/userfiles/file/fenuzafakufizawatulufebut.pdf
    • http://ranchobg.com/img/file/pajuwizowetuje.pdf
    • http://chiuman-hk.com/images/file/73551166555.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=realistic+porn+games+for+android
    • 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_off0000efe7.bin
c445d997b59397dcffb1d47aa369279ad6c51443c1cb337e6e7b5b02433c0e49
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE7 11008 bytes
font_01_sfnt_off00010941.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10941 16792 bytes
font_02_sfnt_off00012153.bin
cfc31918bd4d1dc35aabb3055a29d53225cb775b2827296d8a74c58d5bcb5fdd
pdf-font-stream PDF embedded font (sfnt) at offset 0x12153 17172 bytes