Malicious PDF — malware analysis report

Static analysis result for SHA-256 13bcbb681f46a2df…

MALICIOUS

PDF

79.6 KB Created: 2021-10-03 10:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6d0a460867c901ee1fe93707da93e7a4 SHA-1: 59a7981dc7a14c5c7eb987fa6821d1aa40521c11 SHA-256: 13bcbb681f46a2df71c89b7c73ecabf952cd7b385656c3231ca94831233ec945
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The file's structure and the presence of external links indicate it's likely used in a phishing campaign or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=cabinet+and+executive+departments+worksheet+answers PDF link annotation
    • http://ebsenglish.net/_UploadFile/Images/file/pugesesifolepumukenexaror.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/5556376523.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210902_C97F8241D2F0C2A7.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/82559050486.pdfIn PDF document text
    • https://faguaflowers.com/images/admin/file/95563983261.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/dapatamukefudijamisawug.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/31813635287.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16138e6310752e---pivajapisiliwozu.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/xolonizebafakaz.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/8cc283f0a494c7fa1f793f163ef36f05/68208663082.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161519c1164de4---newukuwifiponugibira.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b48b57f85f---bibaduw.pdfIn PDF document text
    • http://skupka54.ru/upload/m/82705349032.pdfIn PDF document text
    • http://iphysiology.ru/upload/sixosogiteleka.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/takaw.pdfIn PDF document text
    • http://perksys.com/userfiles/file/gutajiserapubiwabusevoba.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/e91a6d07b3552fc9f3dde716c882e9ca/73675235633.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/41156858317.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/56675035779.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133823155d66---pirajugepofapagibovet.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/kilesosezixesiroratalerib.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/sotanisafemurikexowene.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_off0000c4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4CA 21452 bytes
SHA-256: 1d0183dc62a376ef0d5a501a46aaa8c0e28e8fa4e1d54ea486b0755fc69ebe1e
font_01_sfnt_off0000fc66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001147d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147D 11352 bytes
SHA-256: 0e6555f6ab2c7069a050972fd1f292845c560ea66d3734e6e299ac47fa379731

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