Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc89d781efff0d80…

MALICIOUS

PDF

81.4 KB Created: 2021-09-03 07:36:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7cbe55f1a0308c1e811cb67d37b298f1 SHA-1: fa45f53f5e7a7a8f3c290b63535b6b916973e15b SHA-256: cc89d781efff0d80eb136727fee055125db42637f4cc151c0320e76bc2c6ad6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It functions as a link farm, containing numerous URLs pointing to unknown PDF files hosted on compromised WordPress sites. The primary purpose appears to be redirecting users to potentially malicious content through a series of compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://equipociclistaugeraga.com/ciclistas/userfiles/file/jupum.pdf In PDF document text
    • http://toroisg.com/public/images/files/vedasutow.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/jegikazopamineposevuv.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/fosurabuwejugovep.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d38b9bb3ce---5838550535.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/f5281588d93dd2bd53b52df323a24a90/zuzulirumoso.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/jofafezepegituvu.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ce2tuhrf1bglp3pj1i528sdo00/52310554086.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074cd47b8706---fejonanisir.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b36f88fd0b---73619503898.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcdbf2ce93---41357038757.pdfIn PDF document text
    • http://chayka-svg.ru/files/rozofurojodexarunozididi.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/tolagezij.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/lejixod.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b588e77e2f---savurogobemuwe.pdfIn PDF document text
    • https://facades-metal.ch/ckfinder/userfiles/files/18566458529.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/wuxiwasilunu.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/24470010577.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/53864923134.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/xuditixuxaralib.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/292bdebf221d8944916c8fea0eeb1482/57953738418.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b797ee96293---62012122726.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/lagezotiluzavexofu.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e69990f48a---75642739344.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=biometria+hematica+canina+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_off0000d793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD793 10724 bytes
SHA-256: 26ae6d1d742494c3f541edf2aec3d924a52cf91796e9b7e2fa60f463ce3c8353
font_01_sfnt_off0000f001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF001 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10813 17980 bytes
SHA-256: 2a3bcdd6257ddd75e6553d5139adff863a37b5281cea02729d8cb946d11ac85a

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