Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a91a4912039e1bc…

MALICIOUS

PDF

75.9 KB Created: 2021-08-16 09:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3368f9b043337da90535aba955243366 SHA-1: 362d4ff27fd4787e8f5d9663d7f3245d205eca82 SHA-256: 0a91a4912039e1bcd6dd3c2e781071ddb8d2d3c94c02cf8c25908c7c04650ab0
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as 'Pdf.Phishing.Trojan-d2568dad23a94d95'. It contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. These elements suggest the PDF is designed to lure users into downloading malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 8

  • 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.
  • 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://bharatbiodiesel.com/userfiles/file/75878571731.pdf In PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c96b200c2b---17716791356.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f4aac3a37---27467663925.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/7de21h0gb2ee5rngilu7in0sr3/dijotofazosev.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/c37e4c17fce5d9aeb824d15c79426e75/nipalamuta.pdfIn PDF document text
    • http://asahiru-ban.com/files/files/15529466932.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210724233743.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/kunupifumijenekoz.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/garumedijajofaxinikewi.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/nitiwelun.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/tikemiwukav.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/069fd5c254f94c96b4e0f7573fef2ccb/satavigof.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/kafakagabeg.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210704080159726460nfkrlw.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/genuku.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/80338776461.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/demoratelofujoso.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd719551125---fowemoxikebozexowinefila.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610d7b1868f2b---komenedexisabu.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe00a019df---91463039477.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/vubobupilago.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/bokam.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/zumuvaxutowufadekozelas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=mrityunjay+marathi+kadambari+pdf+free+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_off0000c462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC462 16348 bytes
SHA-256: 44e2d8642832b48c3c16bbe9ea07c48e0a41e6129355ae66c45be4058e3bcddc
font_01_sfnt_off0000eea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B9 11252 bytes
SHA-256: 301953a4af2938cb078f8ca97f4cb60d80867a230133883c7225320516b34864

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