Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64b7d043c110099…

MALICIOUS

PDF

92.2 KB Created: 2021-09-06 05:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c55869c4bd745a63c3c7ec1dd4f82c53 SHA-1: cb0b607799ec3c49caee9a3650db43d87d1de14e SHA-256: a64b7d043c1100992214fd7a33db9d27aebd0544b63594743bd7f3ba32b0d3a5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 https://pistant.ru/uplcv?utm_term=aplicaciones+de+funciones+exponenciales+pdf PDF link annotation
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/aa6b1a1d54cbc70f73340d26b3e7d2b3/dazasu.pdfIn PDF document text
    • https://stopserv.ru/files/file/52206100344.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/10996429.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607089ca670a7---82913869410.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2ca8c83a7---kogobikan.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39757205453.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/pesat.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/67114264972.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612b6c70eda5a---42114470047.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/117152672.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/mitoxi.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/23046865742.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118d8bd458a6---jogewi.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/xobusarudamuso.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210830_323E52AE659B969E.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/885d91ae16d0e2abd1d0a94d90f2f3f5/paxisabevam.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/gulupizutuxe.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c15d82d4f0b---70664943523.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/61765889787.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e858a8739a9---xuxitalufujogilupuma.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/fobolosadimiloxokur.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160acbd4e5e003---xatusot.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/7d0ibnp3n0822vj3a00582lnoi/69103465126.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/3682043988.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/xumijigivid.pdfIn PDF document text
    • http://aweibel.com/Photo/file/xoledupezo.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_off0000fb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1F 20872 bytes
SHA-256: d0bec1e261868d26aab9995776e2d301920f910a5697a501fa602f8ff072ffe7
font_01_sfnt_off00013055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13055 10600 bytes
SHA-256: f80a8223914dfea551102bce140b18596b68afa62e2e8e8ad93eb621035aa255
font_02_sfnt_off000148bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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