Malicious PDF — malware analysis report

Static analysis result for SHA-256 60f79384e27450bc…

MALICIOUS

PDF

83.7 KB Created: 2021-08-19 17:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d67ccbe2eecbe80f091463358fcc6ec5 SHA-1: 5d4125c3b7742c673084be973240ed62c6a9801c SHA-256: 60f79384e27450bc44972bfd40c7577e2bd0efd8ed4ffac491910df3aad67fb8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detection and ML classification confirm its malicious nature, likely serving as a lure for phishing or malware downloads.

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://ketchas.ru/uplcv?utm_term=ejercicios+de+comprension+lectora+para+primer+grado+pdf PDF link annotation
    • http://tulsamemorialclass1969.com/clients/8/8b/8b8b36ecbaf17f244e47af75a29dfbe2/File/jenuxubo.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/98527270797.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/nosozelibatiwat.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/0vrmo7nnad5l0bh9adivnjquss/bofufewegaxe.pdfIn PDF document text
    • https://jetaime-shop.com/files/39519600655.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/32020773283.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2197bfd2773043473e41678898aca552/51763860699.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9699218d6---11087961819.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/lunikejopulijogupiliroris.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/93655198610.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///4816203782.pdfIn PDF document text
    • https://hgb.se/filer/file/38957605980.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/diwokizawokikorelokuwa.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/120da7f423e403dd6832b5f2d1aab611/zuluwubogumudila.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a942939ad4d---xuzodugujevekefitelarop.pdfIn PDF document text
    • http://agama-rc.com/upload/files/foxalomurefifemesanavik.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fbcbe0d89---99167999534.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a419dfb4ac7---93859780608.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/togumisikukogip.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/77d9480418304c187e869a134e33cdb8/mizolifafurav.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d943dcf4e6---39367222655.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/55522431761.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/veroker.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/6c020c5f00b8bb34b5ef439c8d092c8e/60791980155.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/d1b1353260fb34d125315b10b228c44b/lodipo.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/110616184380.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_off0000df5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5D 18032 bytes
SHA-256: 4dbf7fb04d8768e07a7798b85b1d85bdb07ce2164f7b09daccc9094ed1725b43
font_01_sfnt_off00010d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001256a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256A 11076 bytes
SHA-256: eab38f59c6e10660b55d4a5c8da1efaa4a1fed73d52b22384a2e725f979f9814

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