Malicious PDF — malware analysis report

Static analysis result for SHA-256 984956b234c100b2…

MALICIOUS

PDF

79.6 KB Created: 2021-09-15 09:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6f5ce763c9f63f7f60047c80de0f2a3f SHA-1: 0f9b01af162a9cfdc1806bbd1c76230ffb30cfa4 SHA-256: 984956b234c100b2d54b8a5fdbbb46d2662f1e98d20b3eba4ed7241c6e4fcec8
196 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document is designed to trick users into installing software, a common tactic for credential theft or malware delivery. The presence of numerous embedded URLs, many pointing to potentially compromised or disposable hosting, further supports this social engineering approach. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://doctour.hu/uploads/ckfinder/userfiles/files/85916117674.pdf In PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/rt19bl57cgl54e6msp5eogupq7/mixotowasotubomufi.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/44836264527.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/xowixozufe.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/wevusaranumaka.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/fikejupenuwetar.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/livitedogikevixakaloteki.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/95893461821.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/b8e6794fe5dc024166b90d367dc15713/74969970621.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/revegosakalukiremoneli.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/newidoxuvakuxamozu.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/sovopepineriw.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/161374d351c9ca---rasijefomate.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/39128097683.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/63246014367.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/7690941390.pdfIn PDF document text
    • http://eva.am/files/10161e9bdb1d8f4d.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/pirujujojubixurar.pdfIn PDF document text
    • http://cudicio.it/images/file/90903376477.pdfIn PDF document text
    • http://huiking.cn/uploads/file/061505392153.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/zemomoguzutojuwomo.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/f3b1d5464b346e98b92d8bb928ad7925/67139582215.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141727e6d8d3---zeburakosuzebusi.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161418c0346c62---74674598489.pdfIn PDF document text
    • https://linardi.ru/files/file/puxokux.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/10988378264.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=pixel+2+latest+android+versionPDF 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_off0000d2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB6 17720 bytes
SHA-256: f038535c303816d91a718729ae0d1993e3a56e4fa463f1dac51cdbd4c6d14f27
font_02_sfnt_off000118e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E2 10532 bytes
SHA-256: c090a1f7c7e186fcf458ae8f91d016d25cd22febcd4a31c4d0b6bf9e72405c8b

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