Malicious PDF — malware analysis report

Static analysis result for SHA-256 88365113740dafe8…

MALICIOUS

PDF

87.6 KB Created: 2021-06-29 05:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e750fa6cb9ef680c77db9a268c99843d SHA-1: 8ff738fc7291aab5dd29c6540e866d36df4a0fa5 SHA-256: 88365113740dafe8bbf69763507695ea9cb784ccb0f45aac3efbf1ec61dd972a
236 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting it's part of a phishing or malware distribution campaign. The document also employs social engineering tactics, specifically luring the user to install browser extensions or execute commands via the clipboard, which are common methods for delivering secondary payloads or stealing credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://tycoonmedical.com/userfiles/file/rororinisemivi.pdf In PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/4af1ebc32507c79c01a80f14c96bc38c/73770346411.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb99a5308b---87680910652.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fcdbd1614---15608434363.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/1a6c8beb38bd7ff2bc36f36f03706fd0/66527273501.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/gufonilumodun.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/99822123ea95508255d22035fd89a684/71078177267.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/76echrbov700dtj6e6gt0277o5/dimike.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/4a06102784ec8f2c7e2b206f910075a8/dikelowapabubu.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/2682dfb1048a6aee97c1d90488f2ee95/48086493394.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/e8665cfa22ea688948e5055628d6c804/zafaxixawuze.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210517073746113.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7454726509---11861671205.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/16556985720.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160945c61462cd---radofobamawivijodalatog.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160769a0ba4e42---62478471105.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/acb164490aa44706d5d8fbddc4d929e1/45807024190.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/8860565bed21cbaed9531982902cfd80/64085563000.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/vipiro.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/6r90rck9vns4ugpndipqt24ut3/16490446293.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b3d4ead5e---zefolojabokuputovoxop.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/muworezasozo.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16088f76e71083---83279637646.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/53969984175.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/48199717267.pdfIn PDF document text
    • https://piuspvc.it/userfiles/file/72079380770.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+print+batch+pdf+filesPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF30 17712 bytes
SHA-256: 0f7ebcef479700c62dfeaf77a38d5f3bda7919e2004453c0d6741260b5fb0044
font_01_sfnt_off00011e3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3A 10932 bytes
SHA-256: 7fc5bd4235833f23badfcd4a46ffac0f854d8f8d78c2ea33bf2944e23c8f18d1
font_02_sfnt_off0001374a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1374A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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