Malicious PDF — malware analysis report

Static analysis result for SHA-256 f72f2d053850ae32…

MALICIOUS

PDF

74.3 KB Created: 2021-07-14 06:36:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 63fffd3e5173afd9c822e1370a882b6e SHA-1: 5abb133ec83af715c59540ada8682394ac5e6dcb SHA-256: f72f2d053850ae3227be21549259b1f602097afc5f89b66203cde1fe68446775
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable domains. These links are likely intended to lure users into downloading further malware or submitting sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=5th+grade+dolch+sight+words+pdf
    • https://groupunsur1.com/contents//files/48704856915.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/186b1c5ec1551598efde0dbfaa316992/xudamuvuduzawisosoreki.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/gopsmfkvthei03g4qhso888s6o/fetikujidatafarodajiliz.pdf
    • https://kimtuong.vn/isc/public/files/fckupload/file/pajisig.pdf
    • https://bursac.net/userfiles/file/19692767837.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ca08a2a9a---88559631367.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160848db486b50---34957411255.pdf
    • https://gs-hemeringen.de/ablage/userfiles/files/fasedupewo.pdf
    • http://scheiden-maassluis.nl/uploads//file/josowavavunodaropoko.pdf
    • https://fablab808.com/nbloom/fckuploads/file/78174591778.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa17887a18---173654633.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93a0b25951---62348807592.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c23f66e6bb5---32612182041.pdf
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/d3d37640f52b6ce38fa95c76d4d3c67e/redeginusam.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753a3d44f28---xamasakumasigepuz.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/38rltqjso34gub51sr06s85d76/75345790581.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/c5136b428b5d9aace3d2fc5df8280097/jotezesiwik.pdf
    • http://arisutour.com/ckupload/files/gexumonagixakubogovi.pdf
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/nepawazunipamijafapazad.pdf
    • https://laatjehuisweerstralen.nl/upload/file/12552901330.pdf
    • http://www.findvoters.com/userfiles/file/texodo.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0b6a9de56---50517658832.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b87648467f---zinufadexil.pdf
    • http://xn--b1akwe.xn--p1ai/userfiles/file/jukusazorakamezage.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c403.bin
2ef7528464877f684acb3771081a59418370c85348fd52531fe453fa9842a7e8
pdf-font-stream PDF embedded font (sfnt) at offset 0xC403 15288 bytes
font_01_sfnt_off0000ea51.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA51 16792 bytes
font_02_sfnt_off00010268.bin
2defef6457ed0a4e69915d08f009a9369daa7f04691afe1d5f572c643269caff
pdf-font-stream PDF embedded font (sfnt) at offset 0x10268 10920 bytes