Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0ca4f7e8af5b20c…

MALICIOUS

PDF

80.8 KB Created: 2021-09-19 19:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ab7494d241cfd8542b305aa9b4947fb4 SHA-1: 103f8c40392fac78764c609c1ce234bcc08dc293 SHA-256: f0ca4f7e8af5b20ca7c1d6f68a2fbf22294a95d96d27c48dcda53746e9ccfb15
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious purposes. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • 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://tercovci.cz/files/file/jutapelexoluduwes.pdf In PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/mebomebalufepokifejak.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/nubazorowutenawi.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/43404960293.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/rusasagijobezurifaguroma.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/54892645729.pdfIn PDF document text
    • https://temporar.mirceaseminee.ro/printuri-fi/files/11323716599.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/1285934987.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/46028845d517c8864f5805dc9f6684b6/gavavuxejaxurez.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/newujet.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/senikaz.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/2395846002.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dff2bb9e62---xebarorosuxu.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f90f5a9ef---lifapima.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/xumafutosad.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/39145261596.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/8670784439.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/33191763312.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/93629580789.pdfIn PDF document text
    • http://chineseclothingonline.net/File/73242101118.pdfIn PDF document text
    • http://winso.tw/userfiles/file/92050650582.pdfIn PDF document text
    • https://ebooksweb.net/files/file/99093049906.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a43d3d11b2---jileborumisabodibop.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/bunorobimotudonimi.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/20804140503.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612eef3306e45---33239164407.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/taberux.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/54456630769.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=pubg+lite+new+name+stylePDF 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_off0000ccfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE510 21080 bytes
SHA-256: 4d5581ce77320b39e4cc6471d9985c13603a2bf7676f89520109fed885779c2c
font_02_sfnt_off00011cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBC 10672 bytes
SHA-256: f3ceb45ab1feb57dea12fb817e1b3a23fdabea79e90a7121682dd9fa422a223c