Malicious PDF — malware analysis report

Static analysis result for SHA-256 40685feb42dfe104…

MALICIOUS

PDF

72.6 KB Created: 2021-09-05 01:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f80fa45272d22341659a54356528bcb0 SHA-1: 1ddd76f3c92af96dab7405ac8c26d37f5190eed3 SHA-256: 40685feb42dfe104b12ed2bd19ca6ed20dcf7ab4f2a14bf753f4bc36a5d5e503
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to external websites. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high score further support a malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure suggests it's designed to lure users to compromised or malicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://archism.ru/uplcv?utm_term=optiplex+7060+small+form+factor+pdf PDF link annotation
    • https://bawwabatrizq.com/userfiles/file/gagowozumix.pdfIn PDF document text
    • http://douzonebnf.com/upload/file///1306530059.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c8165ab5a---95004862666.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/kezilazinikejixir.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/14768451024.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/a1c7e1c1d02e296e41dd29e0e9592eeb/kajipemimoroguwoji.pdfIn PDF document text
    • https://gomaihoa.net/upload/files/susazipalijodadivesuf.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/rijiluvas.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/gikenuganenajaja.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/27936109732.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/tamexobikasarexi.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5e3392eb2---foranazolo.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe5a0c715---29877496729.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/161274778ac5b4---27563821569.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/14e7d484e3325e4239e0484805572e4f/lulonopukutewebebepevegit.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/71230813006.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a139a7905bb---62942811049.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/84958166214.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/gewasevigasonanaf.pdfIn PDF document text
    • http://dsagco.com/Upload/file/90825740648.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/19d5a5b012cb4132fe612eae11d0806c/wowugujizimero.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/36524644487.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c35a9cbd5f7---lonedekafasuxodezota.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/waxateforutadana.pdfIn PDF document text
    • https://eternalbliss.net/file/baliriji.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126361f75947---bunimiwiduwagalowesej.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_off0000b693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB693 11144 bytes
SHA-256: 3e64f3b2e3c8f223938e8595c05cf117f452888c73aa3f98b0885e17924b0055
font_01_sfnt_off0000d0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B5 16928 bytes
SHA-256: d05cd87943d0568d7f125c7fe74e5f868ee820165b33a063d062ee531b645701
font_02_sfnt_off0000fca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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