Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a43256cb79a531…

MALICIOUS

PDF

83.5 KB Created: 2021-09-04 03:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 047dbfa1ac4dc9e53e8475d323df78da SHA-1: e23857d3ab30c45eca097196b17de737cfcf9c6b SHA-256: f3a43256cb79a531b744a6cee6721315d1d448f0bdd34facbba8370a8946bad6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded links are the primary mechanism for this attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://kythuatviet.vn/uploads/userfiles/file/nejowusugamim.pdf In PDF document text
    • https://eniedu.com/data/file/20210808064700.pdfIn PDF document text
    • https://ekaplast.site/admin/ckfinder/userfiles/files/dijojudumali.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/75175416607.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/43184187954.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/dumatorozojabage.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/30612101802.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bc8c0555b---sufopoxadumuxodisa.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160725d03d81d7---11760480301.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/93b9789630463778afac4c6dcbce52af/jaxunubigerosumalexowi.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/1f005ebec38b6f45da821ee657abfe04/24123692476.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612e8adac7125---84584466636.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/ferizatiboguvudabusafiri.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0fdf3d8fb---82865646277.pdfIn PDF document text
    • http://klpa.net/userData/board/file/nigenojovemafowazo.pdfIn PDF document text
    • http://rayzerfamilyreunion.com/clients/0/08/08e2d5bcffca37c2e1a82d364f4296c6/File/54615534819.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160785ba20b2d9---82274213036.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/f60c2ff85a1e62735c61c13e63cfc39a/lopisuxadori.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/33936172725.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/6737219959.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/4436168468.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/93059296686.pdfIn PDF document text
    • http://aimic.com/userfiles/file/wisorekorenibadagito.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=condyloma+acuminata+journal+pdfPDF 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_off0000df77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF77 18312 bytes
SHA-256: 40aab378284dad678da3608a301368d41a5911b028c633645f1a80b294e497a0
font_01_sfnt_off00010f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12744 10856 bytes
SHA-256: f16a37979a8e7d5c3ef036a1ae664def81bd8b899e1ba0ef57e94c506c340fdb

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