Malicious PDF — malware analysis report

Static analysis result for SHA-256 3643d0861fc7b966…

MALICIOUS

PDF

81.9 KB Created: 2021-09-07 18:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 67bf1692609c82cf12650cc56a7a7841 SHA-1: eeb7bd747ae56d2e3a03e3fd2acd16ac3d0df6ff SHA-256: 3643d0861fc7b966d64be9f95d55dd01f0843580d30fa043611dfa4274cc752f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external content, consistent with phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=google+chrome+shortcut+keys+list+pdf PDF link annotation
    • http://speckrepeg.by/UserFiles/files/zivitopujalatikak.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1629824758ZGFk.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/f54mkroh0p0ev3p954dqkkckqa/63145750921.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1451940bb8---befugovafosud.pdfIn PDF document text
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/dojasovaji.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/72035788220.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/e34bc5cc1eab5e3318e83bb2dfb452fc/xutewivabuxudevuxapexo.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/71509493961.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5a9aeb193---2289739922.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/jisigulezavibaxevuga.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/dufevidijeriv.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7551c44fe3---87817476168.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/70508635688.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/jikefiputaf.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/35773534166.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/44iub8el8vq381d6rfkps7iok2/973228126.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/mufagumubeweko.pdfIn PDF document text
    • https://dm288.rs/slicice/file/masefigitotabekil.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607a98bb6c959---24901327055.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/99708302933.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b97d52079c1---25067906224.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c27114a34a3---38783452208.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/3eecc219e404449c9b66616d5524b937/banebu.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16082941833ce0---67549262430.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/pidevovijulaku.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_off0000da30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF242 17564 bytes
SHA-256: 869166fd346ebad7b779e2d284fae07de5426a33ba46a76c707c8af24029e0d2
font_02_sfnt_off00011fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB4 11148 bytes
SHA-256: c353a03acc774a9420619c86661483182247ef34f16ae3024a8137e60713cfa8

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