Malicious PDF — malware analysis report

Static analysis result for SHA-256 32b5cbe960e6fa02…

MALICIOUS

PDF

82.9 KB Created: 2021-07-18 20:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 405c5429e4b003d1fab8d0c96f58d0a6 SHA-1: 9377dd625f5732e7baac4b1fac25d7660023930f SHA-256: 32b5cbe960e6fa02c8f6ddaeeb7205babd9b6471ae6348ece273eb01dd805ddd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with many URLs pointing to compromised WordPress sites, suggesting an attempt to distribute further malicious content or redirect users to phishing pages. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/1726aac0cc4415f1cfc86c298b417ff4/19249948182.pdf In PDF document text
    • https://mojer.bg/files/bugiwebolidikiba.pdfIn PDF document text
    • http://szrealty.net/uploadpic/2021-5/file/2021051512215873499.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/5f4da888d3b5cc41c1b4563eba7ec6bd/16980839978.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d22ac55a4d5---duvoxeviborebufijaz.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3a8a1ac2e---gorojawumabefokajemasopa.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/69878977098.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/68026798060.pdfIn PDF document text
    • http://deltools.com/userfiles/file/mozoze.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc36d281116---gapogexeninoxokilidatobom.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddf16af478---zobekefetobemopudutisaw.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1606e21c078fae---tokukaboridiro.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/vajudojavawanadovetaje.pdfIn PDF document text
    • https://vieiras.pt/imagensprodutos/file/kijakozudarofedi.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/91620018803.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/gegusuvamitutuzexawivi.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/kuvewifibafodusixulo.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/52566441971.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/jkfvsgl5m0aav632jiip3qevhv/36994761794.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160881a8ee02c0---72163638558.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/63prj4rbpcmehl76d0cnvccelm/gizuwapurururuxojomitados.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609d36a45299d---19413747311.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077b4aed00cc---loxaditu.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb579d292d---16173589516.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/14796882900.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/27736454629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=jobs+that+have+to+do+with+stocksPDF 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_off0000e172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE172 10592 bytes
SHA-256: 8df044724a9cce33ca0dac3a1bff55b6668072d973088eca788fa191c2f9d972
font_01_sfnt_off0000f9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E8 16932 bytes
SHA-256: a0db4c09179ee8874e1c14eed9a6db3a5bb2656e4be7668a9b64099baf21678e
font_02_sfnt_off0001262c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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