Malicious PDF — malware analysis report

Static analysis result for SHA-256 37da88b10dec2739…

MALICIOUS

PDF

80.0 KB Created: 2021-09-07 19:13:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 145636c98d2c1a8ad0e55d3480c86268 SHA-1: 1cda4e23f3c3ea203106fd39961672c6989f8046 SHA-256: 37da88b10dec27390f1337b44c05777502a26eaa915d5bb6c1fd28aad5fbe13b
196 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document attempts to trick the user into installing a browser extension or update. The numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggest a phishing or malware distribution scheme. While no scripts were directly extracted, the nature of the lures and the embedded URLs strongly suggest a phishing or malware delivery attempt, likely involving a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://laborke.ru/uplcv?utm_term=logix+5000+training+pdf PDF link annotation
    • https://pointvirgule.ca/upload/editor/file/sosumovolasajozozamibe.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/8vg2uiev8r1uggve4hslgk3ng8/xabil.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/17513578648.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/ronanakubapijelewox.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079ebb977526---24837701024.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/jozik.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/o5ms4odu0jn4elj063i9crqcs1/rolaredebepuniv.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/xifavitelirenepubodeko.pdfIn PDF document text
    • http://mundialimportweb.com/userfiles/file/23525354585.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16084cacd3f317---84764173370.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c51535381b0---12656410653.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lowosironagegujob.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/11375391398.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/funasutotalipok.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/pimenowupezazaroj.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/koxalifuxuzulomomuwatewi.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/subanupu.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3c9110890---sulaxare.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/safebexoxeka.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/xikomuzigasirenog.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ee24ce0733c---fifojediliguvedafotak.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/d9a9e173aed5aefe5e526c146e36f5d9/sifugobepenoxosoxafuje.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb2c1e34e1---sefokojawalevumoguxozon.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d42a3e9dd---11052546411.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4c3a6a4ed---xerozivo.pdfIn PDF document text
    • https://netkat.in/ckfinder/userfiles/files/naxiwadiwadalelimutekim.pdfIn PDF document text
    • 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_off0000cfd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E5 19244 bytes
SHA-256: f27ad15ce3aff136b8a82c3072a7c91db9fc5627d78c83fe4e328ba7f1d91be7
font_02_sfnt_off00011a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A57 10644 bytes
SHA-256: ac405cfaf3ac525d116349065f60a6bd265b3e434da02be9566e3c4f6973a373

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