Malicious PDF — malware analysis report

Static analysis result for SHA-256 6467c1010ef0f079…

MALICIOUS

PDF

81.4 KB Created: 2021-08-21 09:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9ef8df7ebe8c51780f4ef561dabf71f3 SHA-1: e27bc483df5c6a15d125f979ce9fcbe924a2d6c5 SHA-256: 6467c1010ef0f079e55569c4017c1fa53ba4cbd85300ec4be187063fa686fc65
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and does not provide direct user-facing content, reinforcing the interpretation of the embedded URLs as the primary malicious component.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=10+ejercicios+de+progresiones+aritmeticas+resueltos PDF link annotation
    • http://tgtech-auto.com/userfiles/file/razorifuzune.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/ac720968171a7b2bf60300ec7f8fe633/35931970685.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/19722782636.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/94988180356.pdfIn PDF document text
    • https://ebooksweb.net/files/file/70496353080.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe7774d71df---78979425455.pdfIn PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/57269710444.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/c8efaee63aecafe8f96bceeb87b06dda/62980816631.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/zijaxedugusilare.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/selowedoruforixe.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/xawufazodujudomede.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c9237f189ff---sezer.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/13230455392.pdfIn PDF document text
    • https://vpmemorial.net/images/file/pogujutepezize.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/pogojijitexij.pdfIn PDF document text
    • http://balone.net/_upload/file///takasututezetareruguwilu.pdfIn PDF document text
    • http://hrudolf.com/userfiles/97937875666.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/llf6r269d9map1fj4fdau2jsn9/jebugasafalugow.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/xupafikexovabizit.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/zinukak.pdfIn PDF document text
    • https://tonitomov.com/picture/file/rateduxifozigig.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/nukoxovosate.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079e4511958f---60653847.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/39697540958.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_off0000d8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CF 11164 bytes
SHA-256: c5452b98c5a95b3a22a5d10a7ea161311cdd25d6a32e97777a8191559936dec8
font_01_sfnt_off0000f29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29F 17132 bytes
SHA-256: 84c4af390d3aaec4e776e01af4b395736381199331601c5780dc0f1eb18e2291
font_02_sfnt_off00011d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1