Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ef12dea2c90a8f…

MALICIOUS

PDF

82.1 KB Created: 2021-09-21 12:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a3bce25e9d63ce6af0fd445c28af7add SHA-1: 10d0360b729c4eee7801c4dd18ee527da2b1be3f SHA-256: f8ef12dea2c90a8f5cedc58bd80c0d1f09acacb750cfc541dfed99f5f753a3a3
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple URLs, some of which point to compromised WordPress upload storage and disposable hosting, indicating a phishing or malware distribution attempt. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document's purpose is to trick the user into installing malicious software by posing as a necessary update or plugin. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 8

  • 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.
  • 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://emailreceptionist.net/userfiles/file/jelagaxibuluvudazirobawu.pdf In PDF document text
    • https://colakcivi.com/userfiles/file/bifaterupukodum.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/figawades.pdfIn PDF document text
    • http://thepducphat.com/upload/files/nutipinitofulivonejinijaw.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16147da46a5257---68052005530.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/98150466872.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/91058712131.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/9207132176.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/gelakizivajojoloxud.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/lakapiribagokoduzisoxumod.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/kolunuded.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/firaxenazusape.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/64258628152.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136d8f96a948---76649900591.pdfIn PDF document text
    • http://kco.su/userfiles/file/sifutejubukatedonen.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d0a58abc9---dewemewitizasovije.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/zojafuges.pdfIn PDF document text
    • https://patc.fr/imagesfile/21574959352.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/jimubavisajagitulanani.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/59464405979.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/luxitepebovorukaxodaze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=android+get+user+agentPDF 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_off0000dcd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD3 10460 bytes
SHA-256: 19c18c8165193ce8d8f6740844a14c3d0a773610f6301aa4cc1a799495429a52
font_01_sfnt_off0000f485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF485 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C97 17876 bytes
SHA-256: 79935db29e1d9e3d5b0e068e325095f29c77e8ea898514d86e0c2d23c371d536

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