Malicious PDF — malware analysis report

Static analysis result for SHA-256 32a81d24b2f362d3…

MALICIOUS

PDF

77.9 KB Created: 2021-09-13 13:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 94f1e393253f45edda8e0115391d629a SHA-1: ee2eb27aadef093c17ea0523ce05942c5b4b422f SHA-256: 32a81d24b2f362d3c872a48695680e478a8422335a1847c8acdb75d36ff81e28
196 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various compromised WordPress uploads and disposable hosting sites, likely to download further malicious content. The document's content and heuristics strongly suggest a lure related to remote support tools, aiming to trick users into executing a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://catamma.ru/uplcv?utm_term=teamviewer+remote+access+android PDF link annotation
    • https://wilocom.ro/ckfinder/userfiles/files/3815714066.pdfIn PDF document text
    • https://lecachet.fr/docs/files/11643998124.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/58207751645.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613efada08e22---12827762050.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/mapaparixe.pdfIn PDF document text
    • http://talesma.com/E/file/72971783458.pdfIn PDF document text
    • https://ourguarantees.com/userfiles/file/nudodigoxidirej.pdfIn PDF document text
    • http://esejsc.com/upload/files/relebufebapekaxukegiluve.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e75a3348e7---84731694780.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161315eb2ca1ec---fabomudogaxibaxu.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/97be5dec1b1a094990391fe2c6bff46d/xibobe.pdfIn PDF document text
    • http://nprofit.hk/userfiles/91427005448.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613680b430af7---58011056497.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16138b6a6349fa---94375072684.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/23091065500.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/jodizuzifapovulilas.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/kiturawadogogeral.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/berasoxolop.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/wikomu.pdfIn PDF document text
    • http://kaies.cn/upfiles/210908182825272930p1kwgm.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/kalonibuxirepivobuvigez.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_off0000cc6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE486 10600 bytes
SHA-256: fd4d655fcc9ba3b2bc68b744b7d94fb3b85fdd73f636d43acdc28e9ef7a7e4a8
font_02_sfnt_off0000fcc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC8 17668 bytes
SHA-256: 03e1590e93b88811e0faf00f41aeb82a21f05502daef31021bb08181b50753d7

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