Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d63bc624614437…

MALICIOUS

PDF

129.7 KB Created: 2021-08-09 06:14:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2c40f46ec08b4e938ad137629dc9a596 SHA-1: 2c0f462f173687accbe997558ec9041639b0399e SHA-256: 66d63bc624614437e5a58f5b7a0bbffa7c16690ff412a4e67777bb94330f230d
204 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and employs social engineering by presenting a download button and a lure to install a browser extension or update. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics suggest it likely attempts to download and execute a second-stage payload, possibly leveraging JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • 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.
  • 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://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/ed2aa2e165d6952280de0de849fc93e7/zofuxepaxo.pdf In PDF document text
    • http://progfin.pl/userfiles/file/tanidizizazonuwenof.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/35153181649.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/31bbc3e864ee66fca75842f82df6ad2f/sojofanapivinapanokusew.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/74850418589.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/42766588862.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/duganaluvefakogutomug.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/ftm74bn79nv5tu2ai5i2fenn74/tekagizakozilobuduxad.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085439d217fb---70313936078.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/dawidomivo.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdd7cbd510---3277165616.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/lireretedekof.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160942f9b0a6b6---53042445787.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/4158802dd44cc15e7c70da46092bd561/93175804887.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/92593325264.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5871aa7485---gonorodomevobaxumoxoribu.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/34126020955.pdfIn PDF document text
    • http://voijin.com/userfiles/files/27994655246.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/sufopuluxulafubedud.pdfIn PDF document text
    • http://93564497.com/userfiles/nudelukazi.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/kobusavewip.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609005151f382---tumun.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/50987218703.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=typing+master+free+download+full+version+2020PDF 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_off000181d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181D4 17476 bytes
SHA-256: c81c2866f6164364f31e026893226f44e6a9283b3b2b1b8de2fdb2a27ab0731c
font_01_sfnt_off0001afb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AFB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C7C9 11412 bytes
SHA-256: 9046e95badd47654113c97b1dfda0eb53c5db7d61c318831ace135fd53cf288b
font_03_sfnt_off0001e29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E29C 16116 bytes
SHA-256: 74ea40c6abafff908ba0a862ebf25ee1d47d31f530ca964bdc695191fb21b084

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