Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2768bbca70c5283…

MALICIOUS

PDF

92.6 KB Created: 2021-09-21 19:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6b2b0a9aae4aeb922e25a4970daaabd4 SHA-1: 491a95a335b2d11be21318f6d85dc26622d53536 SHA-256: b2768bbca70c5283f1130a40d08d38994e27127e6b40ef0930165607db5de28d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=planeacion+educativa+en+mexico+pdf PDF link annotation
    • http://mebelhotel.ru/userfiles/files/24917424730.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/31496627159.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/kezevumovisalupiwataj.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/buvakerufojakerabalanotup.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f5db8f676---jejesova.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/vekal.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/ponepewovuf.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/84006601161.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a8b72b9b0---fosoxumafojozo.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/34817090075.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/abd9c2f05b37a116758c8bf9ee869738/46492048025.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/83170077683.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/jumepipa.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/87361035703.pdfIn PDF document text
    • http://linza-market.ru/upload/files/giwefazapi.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/fejewowewasozisew.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/39222229933.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/59891685629.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/815984116.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/9633986895.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/83229631505.pdfIn PDF document text
    • https://cartolmania.it/file/82690162825.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/begoliwumesonikekoxesut.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/92080779319.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/mamedujav.pdfIn PDF document text
    • https://alexspa.pl/userfiles/file/44101668458.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_off00010555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10555 10784 bytes
SHA-256: 7128769f5b48b4dd58274fed07736afcf167b982466f801b3c4f9890fa1fbb48
font_01_sfnt_off00011e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13640 18100 bytes
SHA-256: 382a5acc5443579a8f62fca4747eda1aaab699d45ffd8a2e7b68f624cc96b376

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