Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb416a2d5c9a866…

MALICIOUS

PDF

75.9 KB Created: 2021-06-19 16:24:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 140336f28d736e5dbd2ee9d169640161 SHA-1: 68bc13b458b0a38f29d21f97048dffdea595c994 SHA-256: bfb416a2d5c9a866a82be2aa35c9250d59a439357fbb0f19b12ccd7b1b990d5e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains heuristics indicating it is a link farm and a social engineering lure to install a browser extension or update. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt, likely using a compromised WordPress site for hosting payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://digifast.cz/userfiles/kanojofukuwatebefoviwidin.pdf In PDF document text
    • http://allasclub.com/campannas/file/25960472676.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/96654109577.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/xasogur.pdfIn PDF document text
    • http://bidhichand.org/sahodyatarntaran/userfiles/file/26303665333.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/13541503081.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8c3a379d0---zokatedip.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/1ff62d4b5d46d758e6294ce679f3ec1a/tuduzerogudonezorujunanux.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/fvglbaftrsa5o58v0qquj577nn/jifubimodegozitogaduf.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/4cc49014c8f731b4c12046c97d43c10b/89390239945.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/914a09380e9a172f5312de370d450b90/mujamegoberumodezodiwikiv.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/8294266255.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/206bb715b8530bd2fdc194a0f26f8c95/musujolirazanavuwiwabed.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/cd7816b1a2b42e436148de4b7b3ed1c0/sobapumebisatekesetibo.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/zunekowifekizike.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/67e715d698fbc088659a1d2bdd28f080/kisizupewofemofemelu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=yevade+subramanyam+full+movie+with+english+subtitles+downloadPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2A 5676 bytes
SHA-256: 1af61b04cb8021bd871e9a5b9264f04af89183dad1d83d87f09e2a6895c41983
font_01_sfnt_off0000fd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6B 10700 bytes
SHA-256: a27dba9c83c6540c1cf70c3ee3eb37d3e17f4a7583ce95d9753937e09a43fb5a