Malicious PDF — malware analysis report

Static analysis result for SHA-256 50c4ef911b6ca32b…

MALICIOUS

PDF

94.7 KB Created: 2021-09-05 19:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c126bb860d4cbcc97d310302e76976b9 SHA-1: 07b5f4af93bab58dda4432667983cb3b4d1b9fdf SHA-256: 50c4ef911b6ca32b304914f5e51674ee7e5e405e6e69777a9d52bbca43387fe2
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous links, including those on disposable hosting, suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://bnovum.hu/downloads/30660727958.pdf In PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/64496244841.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/febivakegeto.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/zoroxajokinefen.pdfIn PDF document text
    • http://tmfconnected.com/clients/6/67/67cd703e63b47da0cba1438f70967d25/File/80741152231.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/duxugerulem.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7d8630588---87270041121.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4a8a7684cd---34152396336.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/39169023460.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/7595049917.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/kuwowuxiginafelitet.pdfIn PDF document text
    • http://eva.am/files/319d4fe8923fad94.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/monapekowaze.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b55fb37c5e4---kejiposavo.pdfIn PDF document text
    • https://takitech.hu/userfiles/file/bajinonijudonipulo.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/nepilenuliwamak.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c772a5cfe---vimopazomirapinet.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/546e6757a9b7c3cc8096e93530b23ad0/62189732598.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/48921436813.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/20a75fcd12193ba3cd945588ed2e681f/58948563153.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077b9fd47f3d---pejozemederuzazativowi.pdfIn PDF document text
    • http://muslimofwestbengal.com/mwb/editor_upload/files/48852493096.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=durga+saptashati+pdf+in+kannadaPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A8 24760 bytes
SHA-256: 601f8142286a94bf817cb8f03a489d9913fab523ea7c57fdb08cbb5a878f70ee
font_01_sfnt_off00013382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13382 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_02_sfnt_off00013c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C0D 10672 bytes
SHA-256: c52f4e65320993376b3234b889d9c3667624f194cbe295cee62403084355759d
font_03_sfnt_off0001543f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1543F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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