Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca618596e4863109…

MALICIOUS

PDF

678.6 KB Created: 2021-06-25 18:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6c8b0b942a21f7c60f8a6ec5081dca12 SHA-1: 868529a6189ba1902d1811caf20ebe20189cccc9 SHA-256: ca618596e4863109bd08f043c13d851f0831eeb427f987c4c20c41646ca65235
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links pointing to compromised WordPress upload directories and SEO redirectors, suggesting a phishing or malware distribution attempt. The primary lure appears to be a fake textbook download, indicated by the URL parameters. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely involving the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6732

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://queure.ru/uplcv?utm_term=introductory+textbook+of+psychiatry+5th+edition+pdf PDF link annotation
    • http://hart-metale.pl/gimnazjum/userfiles/file/wegoderevuro.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/dcc68fe3ccd6be9de59c5efd6c189ee0/12756720925.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd41e0c858---71216852279.pdfIn PDF document text
    • http://bjeclinic.com/ckfinder/userfiles/files/17751658527.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/96506666562.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/tarel.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c304f851cc1---numowupawerubowa.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/l1qrislcj82ua1vi74rqfbj94u/9364956000.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/nodabevali.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/61102841369.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ac061d18078---pifelozafaverixav.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/58328362854.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160767001d6ed5---tamekixokipudoxibosof.pdfIn PDF document text
    • https://bloomeng.com/uploads/rajelikikudajisuwi.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/bbe3dcce654894d33d5546e9f99997ae/dutuzakibedigaxoxa.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/392ad31c445e884ceca61bb839fc0057/wefati.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/9c399d855f14828e4722d16a69dcd9cb/julaxedomosiro.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d32d89e592---44086243789.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af404b4aa32---sikazenexobilozazekapiz.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/8bf56e4778b5dca5d24f5c9bc25cf377/fakesidasezilume.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160875f31f04ab---74408476725.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/4360e44beeb57e77ea46abbfe87beeb1/bamubavewipalexodulusofa.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/75625267001.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_off000a23ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA23EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000a3c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA3C03 19480 bytes
SHA-256: 7a9e7d7df8cdef4b8f85cb41e6a77ea0456a46bd906fd951a7cc30b88c15169c
font_02_sfnt_off000a6e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA6E5F 11304 bytes
SHA-256: 0636c4efc56bdd3e052bf2c1709814af6b83ae83f249a703f537b737525ee1c5

Open this report in the interactive analyzer, or submit your own file for analysis.