Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9f5ad2d1869bc44…

MALICIOUS

PDF

73.9 KB Created: 2021-08-17 13:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d66567f6df43797ccee8f8f786c4f9d9 SHA-1: ce0fb81bb7e10a8fd146a53757ef4b1a98de0030 SHA-256: d9f5ad2d1869bc4405ab42849ee71b72a86e3a05c8f75760672586208932d8dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating a primary function of redirecting users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, possibly leveraging JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://drafthe.ru/uplcv?utm_term=matchmaker+fiddler+on+the+roof+pdf PDF link annotation
    • https://dansobentre.net/uploads/file/bamewolefowosunezizo.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a52164162e0---13042245138.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/81754495992.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/vaserirawazarepimirogozu.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/vemebegitafadinixuwulolim.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/65756417671.pdfIn PDF document text
    • https://marosme.ro/hirek/file/wuradilefasadutujaw.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/2olar5t61ufkhefgo774jp02l4/30557799516.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/totodoso.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/mumojaxemu.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a57fbdecd---beduroluzewi.pdfIn PDF document text
    • https://adikkedua.com/contents//files/pabujosawefined.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccc7b8df2d---10991204103.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/4e0341e7c6d00c3bd3c7c8a8db607931/95276893788.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/143b2ecb4878dc3176d533b05490415c/titumejuzumadurenofabores.pdfIn PDF document text
    • http://zuche0551.com/upload/file/52386494222.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1e4e38319---gozonubipajixipesamobuvi.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/tobizapasutinurimufe.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/ligexavu.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/7d15smddf1iqtdg9q1622houj8/16344203933.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/vulobefalawotomuxidotogaj.pdfIn PDF document text
    • http://computerdoki.hu/user/file/bijedekafipe.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098806fd03d0---87742020921.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_off0000be0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE0A 10804 bytes
SHA-256: abb13a08daab8992fa8dd1845e0bf81866c376890148cf92abe61ab4af7c0567
font_01_sfnt_off0000d6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AF 16268 bytes
SHA-256: d3e72fc4d643fca69260cae58133fd78a809a3d0aa0bf3659dc35f228a329e49
font_02_sfnt_off0001009a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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