Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4048eebe0690f2f…

MALICIOUS

PDF

85.0 KB Created: 2021-07-18 07:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 96868616570ca423a79dc07daa129865 SHA-1: 774aa709ceef3d2da03144bd7b79a15323d8a305 SHA-256: b4048eebe0690f2fd5b4a860b86cf201865e97fa454169589a9f2952da4b286b
196 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document attempts social engineering by prompting the user to install a browser extension or update. The document contains numerous links, many pointing to compromised WordPress upload directories, suggesting it acts as a dropper or redirects to malicious content. No scripts were extracted, but the overall pattern points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 https://serwisnawigacji.pl/userfiles/file/6279933828.pdf In PDF document text
    • http://cichanski.com/Upload/file/49997769747.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/tiliwawugojujabupavizi.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/448036c482d954a445c17f697a7ffddd/2276031240.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/6858d1fd7f390222a7a79cf62e1aa557/73954400051.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/vewug.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae07c7c955---81461408487.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c869cf0b508---fufefugapirimivosazix.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/209tfhk1ps9itofc3bivodaub3/46137881594.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075bca6ec129---17095461023.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/sibafubakoreb.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/doxuzofujamobo.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/70067187505.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/duvesebafigebip.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/43771329466.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/67760506862.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/vukuregemobu.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b425bf89408---52788136127.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/ugngn1qtejpk3bk1kbj2q74784/babaxuge.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/6973b2ab4b3f3f224480fba9dee0a500/87961140360.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/10120331160.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/tarejewivirevakoj.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/74d536ff140d9c0a71c31c899bf9b2c3/gavoremujenazolo.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cde91eca3df---94871541509.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/vikimotizowajijifigawu.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843d2aa8b80---fonivonavojozive.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=remove+sms+from+messenger+androidPDF 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_off0000e74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5D 17192 bytes
SHA-256: 402daacb2e6d7214e471f34caf7b42a26854af002dd1eaf9970701340294e0e8
font_02_sfnt_off00012c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C80 10664 bytes
SHA-256: 18fa4fa3f1d22a50ad73cda49ba423595717d34ee3684d7c4963617fa6ed348f

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