Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f8fcf068631a1a…

MALICIOUS

PDF

84.9 KB Created: 2021-08-17 07:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 97ad956eb9cbe0a29c613bd0ee628e78 SHA-1: b6f81f7f649009ab4b12c7980106a3b605f77637 SHA-256: b4f8fcf068631a1a3cb481bffc0303a40e5d725ebceda12d0279be4a4e3ad099
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download' button lure further supports the intent to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/4cl5nr8fvjqiu5m15b8h46qt96/45187288398.pdf In PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/gudaxisipogotebagakaxu.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/xabokuvekuxizok.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/920673630.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/vimemag.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/16760004411.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/64f4987dced2f021c93f794816313cd9/71912979523.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/e1e97d21265d49046814cd0b783e07ce/22715379540.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bae1824f49---80487345906.pdfIn PDF document text
    • http://kalikraft.com/images/file/82266961973.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c33a8183f72---33822940291.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16097591f3a905---sewivopibowigod.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608068a5a57a6---48848866720.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/ls6o8cqgm94d6lcihr7gfar2hs/9645285408.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/57527584527.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/pexudax.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/kisejarofevurabetepiz.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021080814335173499.pdfIn PDF document text
    • http://mousike.it/img_ins/files/78151833718.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/woleposiro.pdfIn PDF document text
    • https://linoforti.it/file/46386865009.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/b4416d0cee81f1f93a2ec9c0a6f38030/dunerodojaguxi.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abce2c5b125---66733962438.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=pichaikaran+tamil+full+movie+download+isaiminiPDF 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_off0000e7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC6 11084 bytes
SHA-256: ee7bd23e1f5353faae59664931f70b079d422bd777f4b06080aa2dfa2f4da109
font_02_sfnt_off00011983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11983 16696 bytes
SHA-256: 5a1190e17b5031d700568a25c23b37e722582963e4a6e8b8217a2cdb0d73ef87