Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a55822607f2a1f…

MALICIOUS

PDF

76.8 KB Created: 2021-09-06 21:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7f9619408366306a00b61dce39d74024 SHA-1: 01a195cc1d15ac596a3aeb5e32422476376fad9a SHA-256: b6a55822607f2a1f4feffbfc635f3f1d26ddf0d3cfb336e1150a7a71f5ba59b8
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites, likely to facilitate the download of further malicious payloads. The presence of numerous links on disposable or compromised hosting further supports its role as a distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/8fc3ea6f11ddda24915fb9fef234fde2/34911928337.pdf In PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/39ctb1isj6tmup9mm0j10fmkho/zadinalefuz.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780c19f308f---bowel.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607adec6b021b---39443637727.pdfIn PDF document text
    • http://yuha.be/_files/file/torebi.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607eff83c77ed---73410168867.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/6e59dc80cc53fd6eb45da417585b654c/zabigelinazunivevumotadi.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/senukogu.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cba57f216ca---30094048480.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021070913573570554.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/c86dca98e1ba9e448d52f546594ee703/virufubawuforigilidoso.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c56e425def---pipirusebokorudilule.pdfIn PDF document text
    • https://ivanamihic.com//files/kobok.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/delazupabuzomimizo.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085251621da8---90870779087.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16074f902c085e---fusav.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/newajadar.pdfIn PDF document text
    • http://idcla.net/upload/files/tufibifoguguze.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/gixukexonawiwenolagefako.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/87006068181.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c0461bc544---84214746678.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/retunuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=electoral+roll+manipur+pdf+downloadPDF 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_off0000c79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB3 10784 bytes
SHA-256: 9cfa5943a967f74ab170fd223d1d400b6002d3ba30b6282b33f5f0b44b43ff41
font_02_sfnt_off0000f880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF880 17244 bytes
SHA-256: f45184d19927135d5c8e527b358e62035a797b0f3577ed604835b4823617a3ba

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