Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e37311a91f40de5…

MALICIOUS

PDF

88.8 KB Created: 2021-09-09 17:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a49ff209a8e48a10a970467dd436474c SHA-1: 0615839f3921104ad8711702cc6d4de0baa9278e SHA-256: 8e37311a91f40de5dd7f3596be20367eb9bf8f34d2e881a4d47cee116c035201
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains heuristics indicating it's a link farm and attempts to trick the user into executing commands or installing browser extensions. The embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/5581546903.pdf In PDF document text
    • http://eggtesting.com/admin/uploads/file/6203732418.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/fusosijorovugomip.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/rakufuwa.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7dbabd836e01d223c00664160708cabf/jexev.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/44994305253.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/96138760177.pdfIn PDF document text
    • http://jfe.hk/userfiles/33462920076.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/vuganax.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/11930590455.pdfIn PDF document text
    • http://mrybalko.ru/files/57275169728.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/76842365876.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/rujawewalutazadadudepa.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/47165776013.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/jm3lrq2ub2oa4faqoh3se7rrp3/87041264628.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/zapofuzegusetukisuviviga.pdfIn PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/14396270685.pdfIn PDF document text
    • http://scpt.it/userfiles/files/sojozeviwatatomulonasig.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210904000033.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/16028426668.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/nukagomegu.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb4454c0c0---linavebuz.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/17345131766.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/femibizadili.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+delete+chrome+history+on+phonePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9C 18076 bytes
SHA-256: b8f4c862278e11faf1ba2badf735d3a8d8cd76dff6fd8d4c043727894e67d400
font_01_sfnt_off0000f680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF680 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E97 10808 bytes
SHA-256: 16338dea7a4ad95fa2b40769244a3b9cedb920a36f9ac0d94d0c5f04df5b9c0e
font_03_sfnt_off0001274f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274F 17888 bytes
SHA-256: da35285b0e30720887afb82cbabec4b38e1b0b31378094852b368f5680436ff9

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