Malicious PDF — malware analysis report

Static analysis result for SHA-256 31044503a68b4ef0…

MALICIOUS

PDF

85.7 KB Created: 2021-07-31 04:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bb605d1b485466c9f8abac8a4fd53ca9 SHA-1: 9145c110f615ce45455369c716745d261eb0a989 SHA-256: 31044503a68b4ef0726c40ae47cb242fca7e1f33476db60385b1563a6d52a5e3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to potentially compromised websites or disposable hosting, suggesting a link farm or phishing lure. The 'Remote-support tool lure' heuristic indicates the document likely instructs the user to install or connect to a remote support tool, a common tactic for gaining system access. No scripts were extracted, but the presence of multiple URLs and the remote-support lure strongly suggest a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://fgosvo.ru/files/files/virasakonurijoxujovaj.pdf In PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d27d4c3078---78105554949.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/buwiwubizi.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/sazujuwororagupazanedixu.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/oquprsvn396gtl1tcnremdi9tq/ragabudiluguxiwolawekize.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/xarixodopozapuwewe.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///77998898512.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/8bf5c24058e5eef9a4da6a145d25d5bf/65845584995.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/53313965749.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/49176a787e743e50aa6aae83008dbfd3/mokewimojorikotope.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/golagupodupamokoputop.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819a8f61d0e---72793779967.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/ab89fba6c38d72ad79fbdc48941b8516/bukega.pdfIn PDF document text
    • http://chinazzjx.com/d/files/xasowamifo.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/fopujanuxitupevo.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/98838809668.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/59033443615.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160b10672a2243---pikopaj.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/wobopavukujaxotimatetim.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ece4eb0039---98927110824.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/pekuna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=introduction+to+computer+security+book+pdfPDF 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_off0000ebe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE7 17180 bytes
SHA-256: 0a0f4b73c7ca4d568014db25ef5c688a14945d563f3a06db7404f48f1c4d6abd
font_01_sfnt_off000118c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130DC 10968 bytes
SHA-256: 9d37eff30b782276366832e0f3bd94b6e23620dc2b3bc7da6e8dc257f0010bdb

Open this report in the interactive analyzer, or submit your own file for analysis.