Malicious PDF — malware analysis report

Static analysis result for SHA-256 726259537278b40a…

MALICIOUS

PDF

84.9 KB Created: 2021-06-25 14:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a9648b782d08d8fd006f089fc1acc609 SHA-1: d6dccbd0b280911a1d913c09517fa18276e59962 SHA-256: 726259537278b40ae6cdacf2d2af1bea697c8c0a5779d6e56be84b0d22b00ff3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/5bd1345e931e9293bdcbb5204ff68dd8/37612105948.pdf In PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/cgedep6n2jujhd552omkrtuhvs/72053782961.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/nudukawotamolage.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758b70c7f24---rabogefixidutokaginaxe.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a48f9c0c2c---gomumov.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/wapozadazilexadogolikidi.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e4c82463efc57e8c4eafcf1eddb4a74e/93605440730.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbab4d206c---dikixobikukuxu.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/55631889024.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6d61a6734---48757801711.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/997526da0ff66ee99a4b54ff011fbee5/13152303513.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/72808824576.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d9aaa13ab---lonemumolupazame.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b10f4f5a7---wuxurugaviporuseliwibo.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/zuputesesumoriwemef.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2d23049ea---zafopijizadamakawilo.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607408f6a5d0c---zafokufuzabubudizelolixeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+many+years+do+buff+orpington+chickens+lay+eggsPDF 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_off0000e8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B7 11592 bytes
SHA-256: caaabe98c993b6515c2c6ffaec5f0a54775eda292b212f2d9632a432c617e0e0
font_01_sfnt_off000103ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AC 16452 bytes
SHA-256: 86f1344ed741af42fe5c84a2d2b2b652c90f68a5fdc0b59df7850163153c74ef
font_02_sfnt_off00012e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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