Malicious PDF — malware analysis report

Static analysis result for SHA-256 3928684600a104c2…

MALICIOUS

PDF

89.7 KB Created: 2021-08-01 10:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d727fcd05cbbd98ed9f367eb40a0d08c SHA-1: a42edc1e606741947a27faacca28c26b0f88e88a SHA-256: 3928684600a104c200e8106050710c9a9710ed1c9fff7c766f0be7294ee07aa5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, hosting numerous URLs pointing to compromised WordPress sites and disposable hosting, likely to obscure the final destination. The embedded URLs suggest a phishing or malware distribution campaign, potentially using a spearphishing attachment as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://oniceh.ru/uplcv?utm_term=how+to+lose+weight+easy+exercises+at+home PDF link annotation
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a53670e3154---xemezabibagukadivefireje.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16092e58e70a2f---29628841800.pdfIn PDF document text
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/gutaburep.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/p4uk4t5oqu69muvfsbsog2dhkp/11332592176.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/r80lrg82ssg7n2n8bd0cntv09g/disobanu.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/waxurakoxuxerudaw.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0df37214c---fumarabul.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/42326606503.pdfIn PDF document text
    • https://unosms.us/userfiles/file/bodura.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/bc0e0900bdc7b4382148d60cc9a8a486/23772227951.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/5jh2m866mubit5k29jp87p0vhp/lodisiju.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607266a437b8f---lonavinibelij.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a348ccdec79---zesufatutojetamesedaza.pdfIn PDF document text
    • https://austarpharma.com/upload/files/wegugegewalap.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607d689563b64---37287673280.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cbed0d127---15516318956.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/c2e4de12c51b2f09a96084f4ce0fd4e2/1289362286.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/51243892253.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161029b5ff2a22---sutujobukafokavonofe.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/4abfa2b970af44c6ac244b595da477ca/rikenawunuxef.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/83bbb12cd06519fa2fa7916661f093fa/43374989426.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/18828976068.pdfIn PDF document text
    • http://ehs1958.org/clients/73155/File/bawipubapug.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/jitufimakiraruxubo.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/kejamok.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/9114641050.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_off0000fb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3C 17012 bytes
SHA-256: 639785985e4d6b956101f338b6b14b72830573aa0530c784dc9dbb76598bfd57
font_01_sfnt_off0001277d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277D 10868 bytes
SHA-256: 36ffbbd56ecf55c0e151d13617e1397398e9d0894b86bbaa0d5ef1846c7f3963
font_02_sfnt_off000140b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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