Malicious PDF — malware analysis report

Static analysis result for SHA-256 b53c807bc163bac1…

MALICIOUS

PDF

86.5 KB Created: 2021-09-24 08:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 099d5742a7d0e2d15706126cd8173f3e SHA-1: 57a32c046b8718ce3a905c15ff763e2a6242f3d6 SHA-256: b53c807bc163bac17be76ea1adf032e66fa43d246379bdbd71e3eef6c0e407b0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to multiple domains, some of which are identified as compromised CMS uploads, suggesting an attempt to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://daieimotors.com/js/upload/files/48616862872.pdf In PDF document text
    • http://teraval.cz/res/file/bepofuzulisi.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/42987804739.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a865c1cd4---konemijelekarefonim.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/16145594595.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/91035064206.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/73312226549.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/34437050763.pdfIn PDF document text
    • http://ridendo.cz/files/file/80003576489.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/pagizuxosegegaxox.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/zuneravimikowawipu.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/sigalatoxel.pdfIn PDF document text
    • http://seamacros.com/upload/file/botamix.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/fojenirepemowotasag.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/tabujovisav.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/70379404665.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146cf175e822---50024016691.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161478f700ffe3---sugisebamikelivedi.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/8213946336.pdfIn PDF document text
    • https://812423.situshoki1.com/contents/files/68133621336.pdfIn PDF document text
    • https://camelcarpet.org/d/files/pejenofojelekilokimuwijid.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/vatidevepozegegeleziva.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/pemadamedip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=gta+cheat+android+apkPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CC 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_01_sfnt_off0000cfc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC3 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_02_sfnt_off0000e552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE552 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0000fd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD69 10528 bytes
SHA-256: c32ded4c0cd0c92a9c63d507aac69cae8421bee890c5a58797d41592516d93ec
font_04_sfnt_off0001154d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154D 21304 bytes
SHA-256: af0f42188f0ca7675d53baea7ccdc6e38e1a0a5b56cfd8027150f336e4986126

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