Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3ad61d7f16e5523…

MALICIOUS

PDF

84.8 KB Created: 2021-08-08 12:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7c43fa18a037e571d5781ce74853020a SHA-1: 454bcb0ecd1d7c589f07045616b051d8b398aea9 SHA-256: b3ad61d7f16e55239a06bf319a1cc86475809e8df4c9f2005dfc8ad98f68b9c2
164 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. It contains numerous links to compromised websites, many of which are hosted on WordPress installations using the 'super-forms' plugin, suggesting a link farm or download lure. The presence of a 'download button' heuristic further supports the phishing and download lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=bewafa+hai+tu+mp3+song+download+320kbps+mr+jatt PDF link annotation
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/a59591254821f1b9a5484542b8e00641/kanolifodixov.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/1420709626.pdfIn PDF document text
    • http://sun-tes.ru/files/file/dakojuva.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/bujerofegivijo.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/858cb0dd7983d18d3743341e1cd83cb3/tivagudiloriziwuremudefil.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a644eb29d4f---berejunugevovige.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/94976542946.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d218460f7a---62115189851.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/f1d6f229a36b402b23c9859dac240965/17193771710.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/22752457212.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/gukukud.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/diwamavevisesesoromawoma.pdfIn PDF document text
    • http://bacsionline.net/userfiles/file/61694058935.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/5416187726.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cf8358ccb---20520552157.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa07477965---piwetijugubuz.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/pobudarivosexop.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/da8770906c1e04ca4ea106405aab0958/95720378460.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/cc90a57175240e262a58cac0599954ed/68820434870.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/81362052634.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210710_040548.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/fomivel.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210611084956.pdfIn PDF document text
    • https://tekartltd.com/upload/files/joxomive.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/76322369164.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_off0000e413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE413 11960 bytes
SHA-256: 4a7df37f0bae2a3f1d73d7a6de2ad5c99bc46feb7ffdebcfc09fa34ca6fbcc00
font_01_sfnt_off00010047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10047 17200 bytes
SHA-256: be1b3b68a35806e00590766c75bdd11f44fa57ca5a45bde468dd171884b4ce08
font_02_sfnt_off00012d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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