Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a61fdb8e7b9abce…

MALICIOUS

PDF

76.8 KB Created: 2021-09-03 17:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8ac0fb88d06eb0431d9d481f63771db3 SHA-1: f10acf5092440280a4cbb201ef2b6b1fefe1431b SHA-256: 9a61fdb8e7b9abcee11e33db64880b40a82862d43463594807274b92990b68d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to disposable domains and compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's intended to exploit user interaction via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/4c13c27e1296c81784891fb4d3e5ea5c/gigizugoputuniluxo.pdf In PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/gematonalexiradibakumid.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/lunaxawat.pdfIn PDF document text
    • http://mamtaniketan.com/userfiles/file/41951704786.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/fimepononole.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0048638c0b---zowutejobanigixidula.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71503b67ea---64061459795.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e0814602e---50768681089.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/widatabofuvabafidura.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/aee1ba9439ee1e3cda389b7812a42821/9574905417.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/d9dlvspc5qlubfh6np06siruj2/tawoboxudodidevotedo.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/96f884bba84a5f60ebb02c68b059c88e/90731694058.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/68462143462.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/92115264857.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/mfb7ff94bq1jnceojot56m4lcb/wixewotugipujakapilu.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29e06dbe45---xepikatagazidupagumajowor.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/6026431204.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210518072311.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/3baaa644dc5885213e61244f4db2744a/dumubejowopow.pdfIn PDF document text
    • http://ruresept.ru/files/file/5249633726.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/dqeag9s0k6udf7cdda6cm7u78k/60641186461.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/66123013938.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=internetworking+with+tcp%2Fip+4th+edition+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_off0000c9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DB 10764 bytes
SHA-256: 1ee1d60c995047541e876640b0e3dfaed0f299ea0c1e1ef4a00a8f8926cc73b0
font_01_sfnt_off0000e279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE279 16396 bytes
SHA-256: 9b66cd8d03dc958f1d3009025cca297b4bcae8c2be2d380fb81ce17589b203a8
font_02_sfnt_off00010d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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