Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef1becb44ab8103e…

MALICIOUS

PDF

81.6 KB Created: 2021-07-23 20:35:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f67833165e1bedb6e9b5bd96b7f72b79 SHA-1: a43c0bda1079d8cc97f0c769aab2835e074678a4 SHA-256: ef1becb44ab8103ede2f3cfc49b2f897d85ecd702e8d958d4af1e732752a86a6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and link farms, suggesting it is designed to redirect users to malicious content or phishing pages. The presence of multiple external URIs and link farms strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/gogil.pdf In PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b36d8b13257---53300592424.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160ae22cbd3e5b---37907725406.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/9225ade882d54b52c7c0056b18d208a6/tomumojadovogojolom.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739d76ef330---32418677990.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e23e11f806---80842522379.pdfIn PDF document text
    • https://ka-base.no/images_content/file/96686060132.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/bc1e875a6ec69dd6ec965190c234ac94/rosulufilikukapewozim.pdfIn PDF document text
    • http://armanetti.com/images/sezenonogor.pdfIn PDF document text
    • http://vejwun.cz/images/tudawavepo.pdfIn PDF document text
    • https://turismoporsantander.com/aym_image/files/godunavujozuzeme.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/lokuvemebu.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd29d18b24---nukosem.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075ba3308e3c---66826273097.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///3363594967.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0497d7e7c---nurisedonas.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/44873141301.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c2434dde7d3---butagexebosijopagibije.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fbad3c24b---jekiwegubirete.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160acd7b778860---givuvupobozulopemamux.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/fejinekujesilajedujifarup.pdfIn PDF document text
    • https://phr4u.com/files/14671846240.pdfIn PDF document text
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/8033a2169732bc9b2d3343ec298fa2ad/gojijokofutetobesisobix.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/94594124797.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/b2ade0a4e9b0d31206898fbaeef9d27c/93878036693.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac0d771afd---60718790363.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=livro+did%C3%A1tico+de+filosofia+ensino+m%C3%A9dio+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_off0000d74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74E 18296 bytes
SHA-256: 0260a7e9360d01ded2631b8027e2c88f386adb9e92e626fae6e444b742381411
font_01_sfnt_off000103e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFA 11140 bytes
SHA-256: 672fcf416c2c178bb6553e40562115441abbbaf282d348655b5bfb9d84777feb

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