Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d94ac8226ad4451…

MALICIOUS

PDF

113.4 KB Created: 2021-08-06 00:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b6de69ba55216e5d527175dbe1d42558 SHA-1: 7307246a6f163535ccf4fab7c7aafaf6041bc6de SHA-256: 0d94ac8226ad4451400e9eff5d940cee7b4d8405b47338d3574b819b41f245a3
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm used to redirect users. The PDF structure and embedded links indicate an attempt to lead users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://ttlh.vn/storage/ckfinder/files/37881671162.pdf In PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/76731746742.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3b54a02a9---21732339813.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/36481549345.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f18973f0e09---56264944859.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/ee87d404981783f1c29b4c29c38e916a/wukitusezaziwuxutixe.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed5cc2b8fa3---11897543376.pdfIn PDF document text
    • https://ka-base.no/images_content/file/pazidiwikubun.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087aad8a3ff3---72799527480.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/fojuvazaxivu.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/lugupe.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/81189258833.pdfIn PDF document text
    • http://riversedgefm.com/files/file/42771940881.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/f80d32f24d0562129119136208ffe4d4/bokapuwu.pdfIn PDF document text
    • http://for284.org/clients/7/74/7452b259410349f427184d5eaa48bde7/File/2065219788.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f940c31cc---guwajoxosexapes.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/29429390249.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/xoxufi.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/berovunegoxevotejuzojanas.pdfIn PDF document text
    • http://irishheritagesociety.net/clients/7/7f/7f3653e4c5d791bf76f28d2bf9929747/File/noraxekabu.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ba9de139e---risitisasujozuvibos.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/87727096141.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/b81a18fad4828a7348452a02f4a85be6/zulubu.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdf0bb82614---24037181657.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/93966248823.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+do+you+write+a+tender+submissionPDF 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_off00015b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B34 16788 bytes
SHA-256: 7675f5a0659e86543449a34ff4d471250e9777b9f5bb048dce2e69373dcf32c6
font_01_sfnt_off000186cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19EE2 10792 bytes
SHA-256: 99fd28124b9b1258f4afc09d24f44489aff7fa1298882ae784b13da9752dbcaa

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