Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfbf3e0b62f4f448…

MALICIOUS

PDF

85.8 KB Created: 2021-07-22 20:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 88771a48f9b6ecf5cc5c9a5b51d1a546 SHA-1: b08e7c42f8f13905a69c22f4205fc7101f4662d2 SHA-256: cfbf3e0b62f4f4481435cb59580386c542d873a3fe7ffda6f89b6910c2fa7643
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to websites hosted on compromised Content Management Systems (CMS) or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the link farm nature is evident from heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://belhasasecurity.com/userfiles/file/lefakefojotenug.pdf In PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/97773367152.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c01a9fe8072---migifigiramozetolefebaw.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/50083947992.pdfIn PDF document text
    • https://kenadong.com/contents//files/xakabaxusur.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5358feb5fa---69120716613.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/3f12be1f06f14c836baae7c1989c7380/82390745388.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/rarunibitazir.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/17477067780.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/wubupidenudexudebizulipuz.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/0ffaaaenqliqd883et4cukn6s4/59062974966.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/81219fdf559beea1ffc40172ff45b57e/kuwokilonukedakafose.pdfIn PDF document text
    • https://itacademyindia.com/ckfinder/userfiles/files/37543355306.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/22301972536.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/toxased.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/paxobapadiziwosi.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/hvrp2t9r0feka4j580vtpmie23/sigeb.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/rodonafobidizotimenaf.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/sipebukezesinutulibev.pdfIn PDF document text
    • https://martabaktelor.com/contents//files/zukodogufiparadijewakasin.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae30ea440f0---guletimujedavex.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/mexopimazewosox.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1b4432240---15394008035.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7c4d93fbd---6698736065.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/lunuz.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/o2cq5nhvi2kor6sgji2ejglaj5/modere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=6.4+acres+to+square+feetPDF 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_off0000ece5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE5 10548 bytes
SHA-256: 6309cff6b93f3da931c5b2ec8d727419f9f917ddee693940430849c43a9de062
font_01_sfnt_off0001052a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3C 16924 bytes
SHA-256: a83d2d5c9c494bc1b76b8748f667c49bc54eff3954a0f67a9931e47a82574d8b