Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bbf3c9c2450f995…

MALICIOUS

PDF

87.5 KB Created: 2021-08-16 23:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dceee631a90927fac6b0c6e4147ac6d3 SHA-1: 9f0644bec46fcc6e9ba3494196baa1f318c81fbd SHA-256: 3bbf3c9c2450f9950d6318a4e4e1507a534f05d6d08c6817318517135e888a44
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the links and the PDF format itself can facilitate malicious redirects, likely leading to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=word+power+made+easy+norman+lewis+2018+pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/1c9d268d53604521fec2d538b282916d/ragoforosa.pdf
    • http://bluedevils59.com/clients/862365/File/mawogunamolawolufisaw.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/ac994760e099471b649a5cbaae88ab94/26887315958.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcba7a73b5---xakewurepulafotonasumamol.pdf
    • http://ranaghatpchsschool.org/userfiles/file/20208001735.pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/9f131749522ccd3a83bd94b21b3c7ca6/9697286667.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16115619987f9e---2767108989.pdf
    • http://animationcoach.com/userfiles/file/30384621975.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/3ce3f34af80056b7151b5a7be6da6f91/vimumimeluwor.pdf
    • http://ankurgroups.com/userfiles/file/84159361998.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608887352cdfe---xejugozenodijimi.pdf
    • http://logiccpacma.com/ckfinder/userfiles/files/nujerunuwomegokoro.pdf
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/pudutitovu.pdf
    • https://santevita-bg.com/ckfinder/userfiles/files/14074327143.pdf
    • http://hydrem.ru/images/file/levokageberojugebatoku.pdf
    • https://telenovella-bg.com/files/56342348483.pdf
    • http://medob.org/SITE/files/editor/file/18984293027.pdf
    • http://absolutelyneon.com/userfiles/file/72500001002.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b131b2d082a---17364999323.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/4f6eb57034e2b7aa26b0a165e17afe43/rasuwusir.pdf
    • https://roweryelectra.eu/app/webroot/uploads/file/1620101300166.pdf
    • https://aawyx.com/sites/default/imageuser/file/momudiwef.pdf
    • http://aite-materials.com/upfiles/file/36405594786.pdf
    • http://gartenbaukoeln.de/uploads/files/45554286841.pdf
    • https://nadamasristorante.it/file/58614843349.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1d5.bin
ef22ec0ac8434088479c8ea3b54ef7997a06e4f8d6cc230e3ccab4f6cadad301
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D5 16620 bytes
font_01_sfnt_off00011cf1.bin
b8de85f655836068d29b562ff26aae6c6896da257b6b85b5a0b371e9b2a35fcb
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF1 11256 bytes
font_02_sfnt_off00013770.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13770 16792 bytes