Malicious PDF — malware analysis report

Static analysis result for SHA-256 44ad5a83b49203b0…

MALICIOUS

PDF

74.8 KB Created: 2021-09-05 23:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c5574caf6abb237147a1f202e212c67e SHA-1: 53db2d9092929344ed473d8a65929cc8c30e3166 SHA-256: 44ad5a83b49203b01e13d48c34fccc6ce092400cbb0427e799eb6d2be8d9d590
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to direct users to potentially malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://irlanc.ru/uplcv?utm_term=cell+structure+and+function+worksheet+answer+key+chapter+4 PDF link annotation
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/2d5a0bcd0c1ce8f168c4df53de30a8a5/96349753871.pdfIn PDF document text
    • http://gtshotel.it/images/file/2845033846.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd46b644a7---18301501800.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/sogebadag.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/23672738932.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c551fe8d0ea---lozeluvupopaxivuvole.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/2112036545.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091571d38dfb---28580234756.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/pafedexeluvor.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/nofv869trrnpog1clsasohhj3a/pemabarepebuwoduvaku.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/3fac1adbc8a816ac44bd8fbc1bd858ad/zixadoguzek.pdfIn PDF document text
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/rinb7dqrkjfqnbdut16aq1lihe/felumevoxipoxatorej.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/pekanubosipuxodixesekama.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/vg92jqhqif8h31ec8hvagkpkob/niwolebugokefasozow.pdfIn PDF document text
    • http://cosyromania.com/media/file/jaxivu.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bef51d2c78f---52442964105.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/31838331425.pdfIn PDF document text
    • http://apnorajasthan.net/userfiles/file/35846010480.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160856ecbe9876---dazadutor.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/8befc9ad48045b59cce1426ca0576929/12918993304.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b2c0f14f59---218870434.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_off0000c19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC19C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B3 11220 bytes
SHA-256: fec268711f2994b5c1b39a21eee8bbc61356d201ca5782225c1c1fc62593cae9
font_02_sfnt_off0000f40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40D 16100 bytes
SHA-256: cfed01d30dc825eabde846c674f5c0b515040c2d627d8fdc6204fe059fadb0dc

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