Malicious PDF — malware analysis report

Static analysis result for SHA-256 443916fe2ef37407…

MALICIOUS

PDF

79.7 KB Created: 2021-09-05 15:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9ce9a07f746fc3d4f5eefe8426dd03be SHA-1: 7fe2d4b467c0a0f2eab9370a7c3734b5caa28c80 SHA-256: 443916fe2ef37407b1f3448535e58ddab16755dc8098cb4a658796ae086ee8bc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains a large number of external URIs, many pointing to compromised WordPress sites or disposable domains, forming a link farm. An embedded JavaScript stream was also detected, suggesting potential malicious scripting activity. The combination of these factors indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://xn----otbbfbbknchz.xn--p1ai/sadm_files/susawobitikositanesove.pdf In PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e958d91be4b---25836827027.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9731482bbb---84437468390.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/22135769749.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021082212072473499.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b7666c172---jijesupatu.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/61789048988.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bedad708ecc---8314429819.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/forola.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085bba27bfa5---lenoxa.pdfIn PDF document text
    • https://andrejc.si/files/file/sitokoki.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/9c8dc89c6169f7fc4def24197f60670d/13906362876.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/zivuwa.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/fajik.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/lavevim.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5c698b0f1---duwoxoxamuganuno.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/mawovarawebavedodode.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-08-11/images/files/91136418581.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/42159271423.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/38412680874.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/83278563657.pdfIn PDF document text
    • http://momsystem.ru/public/file/16477440583.pdfIn PDF document text
    • http://katachizu.com/img/news/files/wijaziweroxadenaj.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/kefalopimawupobiwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=boyle%27s+law+graph+worksheetPDF 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_off0000d0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A8 18052 bytes
SHA-256: 635a6451a46f1d36555b31b548857c3011fa39aa7752b923abcf8e8566d73b2f
font_01_sfnt_off0000ffeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11802 10712 bytes
SHA-256: c56b7cf5f11c12ae1654b6cf886d24d637cd7c440156de1a0382968e8bed04e9

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