Malicious PDF — malware analysis report

Static analysis result for SHA-256 d801c7a2fa0a839c…

MALICIOUS

PDF

75.9 KB Created: 2021-09-08 01:20:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7b13398c8118a900894a93c47e003bf5 SHA-1: f2712e8672f5337946fb316d131d2ab20f9af632 SHA-256: d801c7a2fa0a839ca3aedf0feedbcb61bc6459733918ee97cc54bdff11d503e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs, many of which point to compromised CMS upload directories and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The document's structure as a link farm suggests it's designed to redirect users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://philabc.ru/uplcv?utm_term=care+of+terminally+ill+and+unconscious+patient+pdf PDF link annotation
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606e45fb075fd---94516841516.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/fudiruzu.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/e1q4hs8kbi1ep3qpkft8rqdod1/26505054552.pdfIn PDF document text
    • http://prosquash.by/data/96117236964.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfadfdf303b---vobazevubefogakikorela.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611ec82ef3dc7---lurukevafiv.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eafc99a0c4---pidisovugejakubut.pdfIn PDF document text
    • http://c-amc.com/upload/files/44220501492.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608de0607e53a---waxajitewufuv.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/91549174974.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/tagibenufenupat.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/bizukabonididus.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/71137542501.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c884ed2d6---wopavegekovi.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/31340902059.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16121b63fbfea4---nekupoxowinufadebugeleba.pdfIn PDF document text
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/dudoruguzofej.pdfIn PDF document text
    • https://papiratisk.cz/soubory/naxupujuzebonisoxata.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160da7bf692e5e---madirepomibesukuguzet.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd0f714d19---76044751238.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/dibubuwawijin.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/jotedanavanixef.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/lomepevepe.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_off0000c50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC50E 11024 bytes
SHA-256: 6cf6460679e1d9931e7ac436d8f52f3c9608b2574a45e39645e6bab1c5aac26a
font_01_sfnt_off0000deb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB4 16668 bytes
SHA-256: 0689fa921ed52a3f1865e5133e096a1a3f46cfe999e38bb48567fd8a6a3950b7
font_02_sfnt_off000109b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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