Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aaf101b9a217643…

MALICIOUS

PDF

80.2 KB Created: 2021-08-28 23:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fdf730ea253236310758b3f2f03cc0ce SHA-1: 100dab4cad73b4f9027dc6522ba407fd742b1968 SHA-256: 4aaf101b9a21764382c75fa08f5acd4057c5f14a638f150de124879ba1c13232
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous external websites, many hosted on compromised CMS platforms or disposable domains. The presence of embedded URLs and the nature of the heuristics suggest the document's primary purpose is to redirect users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://medvor.ru/uplcv?utm_term=death+in+the+family+red+hood PDF link annotation
    • http://rickgrisolia.com/userfiles/files/64273652986.pdfIn PDF document text
    • http://tcihk.com/userfiles/dugebufuxuvumer.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/88648619396.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/66209422312.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/5570823366.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/k4bu4s6cn9j8l7gbnqf2g5m8q2/ninuw.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/3400389692.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d48d152e68a---35496145885.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/moxubomoledizida.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/titokusone.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles//files/lubuzukufo.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/ae2sov7baun078c9k4vbp5bodo/82043876756.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/figuwegilikupirabug.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/6c4b82029176d8bd2513bb3dd32cd8e8/misitimuromafa.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acf8fcc83d8---deduxetugatowafididoso.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/xagagivipi.pdfIn PDF document text
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/22301510317.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/vifex.pdfIn PDF document text
    • https://anfauglir.com/images/file/99107051149.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/26800040792.pdfIn PDF document text
    • http://mp-journal.com/media/file/waralupixabazujubagizul.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/1954748f98caf043c6e7a57290ff5f97/5411120600.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/2199303099.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_off0000d744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD744 16948 bytes
SHA-256: 53f68c56c65c8f5738555e810ac7c3fbe666f57ff67f5a0e4312d127b87e8fc7
font_01_sfnt_off00010323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10323 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3A 10568 bytes
SHA-256: e4f730515a875ffbe7fc6bc319e69336e05daa52da41301fb1e85c1480dfa534

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