Malicious PDF — malware analysis report

Static analysis result for SHA-256 fba4a60da1330bfa…

MALICIOUS

PDF

89.2 KB Created: 2021-06-29 16:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6979561b3cd951d00af7d12099f3f3fd SHA-1: 7d19a18d372dce7c2df254b20fb83fd300891419 SHA-256: fba4a60da1330bfaf2b9b604abcdaafbe6553c1ee8862c8e46c60231b2bebcfb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection 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. The presence of embedded URLs and the overall structure indicate an attempt to lure victims to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://laborke.ru/uplcv?utm_term=5+bedroom+townhouse+for+rent PDF link annotation
    • http://medicamarsala.it/userfiles/files/44177022618.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3003ec981---regibotemukunado.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160730fd090f7e---difobiloberuzulen.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/6434a49eeef997d3b6c1a739a5d52a79/vufizovadomowibikak.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc43dae7f0---lobaletezewotebabaduvef.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/4c0c13ad0a38ca6aafe07ed4248e0244/giliwikibixulinebapinumi.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/62515110440.pdfIn PDF document text
    • http://artospace.com/pics/file/bejesavedanejojarepega.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/d2e6023d3f47bdc03ea360caa25d4607/76110467241.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/7a940946bbe1d88a5f486b75077fc0cd/77884271620.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/libuzodemifupalirix.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/17704553265.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/bolefokevakakoguk.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17bcb31690---81275406299.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b61e9d30a9d---jafiz.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fa810af7a---15503060782.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160804e8655c90---39970253071.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/f765bf6f2f0d9e61ffe07a7e9a9e344d/76445220528.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/pefizuruvuku.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/22101580588.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16079f1608c108---rodixomevogenirorota.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16092d7c2b63e4---tugufoti.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///86672491420.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_off0000f956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF956 10684 bytes
SHA-256: db38e54944f7ddb0cf5df6bbf367a82a280fceede15b435c03dc5f144f451996
font_01_sfnt_off000111ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AC 17484 bytes
SHA-256: c1e20f82a0460c876a9a1f49befaff7f72dc2aedfa089da143b1d9e43e20e8d2
font_02_sfnt_off00013f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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