Malicious PDF — malware analysis report

Static analysis result for SHA-256 e26052712edbcf4f…

MALICIOUS

PDF

83.2 KB Created: 2021-09-01 13:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f49d09e9dcd94cd579e2ee4733adcf51 SHA-1: d572bb44c6f73baaab7101f53c60ec457b53c0ab SHA-256: e26052712edbcf4f7b6715624b130b1555898132050137c9d2e9010423537f3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on potentially compromised or disposable domains. The presence of external URIs and link farm indicators suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://dlzhrjd.com/images/uploadfile/files/numuxelixexiwutazimujux.pdf In PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/a03aef00a392c826417dfcc32e33b16f/45179467289.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/1caa5cc4060f3e86b7b31852456e1eab/72508054259.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/98857281106.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/7d2bb052225e387b5328d4f4e8a8b276/98218765172.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160e231c4c3ad3---78647433313.pdfIn PDF document text
    • http://plncse.hu/php_data/file/99768236241.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/67326164178.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/miturubilixotugejo.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/kadowen.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16098315c4cbb4---pibabesejotunoxe.pdfIn PDF document text
    • http://talleresjpg.es/img/file/dalubemerimajifov.pdfIn PDF document text
    • http://ildiko-szepsegszalon.hu/userfiles/file/44312458107.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/lofelosivusa.pdfIn PDF document text
    • https://congchungnguyenlieu.com/uploads/files/midasekikitizapogawa.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/zolujeraxovikorojiwaxara.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a215495f2d3---3928842622.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/66278377055.pdfIn PDF document text
    • https://bloomeng.com/uploads/devokiropalunojijosukamaz.pdfIn PDF document text
    • http://piau-po21inn.com/CKEdit/upload/files/58785402186.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/28557129383.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/72f58868d9470c7e44888d47c5de27c4/24984278952.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/61030148970.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/f8cc04a335141c92a5116fdaa7970329/jewunatus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=important+codes+for+androidPDF 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_off0000df72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF72 18212 bytes
SHA-256: d4fc7e9d524e518e065e7ecd4f7126fcb7c9e7d511a396a6545fcf79be2d4c67
font_01_sfnt_off00010e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E86 10688 bytes
SHA-256: a0a7a592ee47bdd10e8cf6e937e5d456ac76055f23c78d215cbb41804e979751
font_02_sfnt_off00012700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12700 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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