Malicious PDF — malware analysis report

Static analysis result for SHA-256 65ffb0bc3bbb2403…

MALICIOUS

PDF

100.9 KB Created: 2021-08-16 21:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d8142dfc5e0ed6cc575461d0df6aed19 SHA-1: 227d0430fb16600c5007317be234264bd345e4fd SHA-256: 65ffb0bc3bbb2403a7d5a969b96fff21cc2d6f74a982bd4fd1f9206dc8b9e873
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links pointing to compromised websites, many of which are hosting other PDF files. This behavior is indicative of a link farm designed to distribute malicious content or lead users to phishing sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608aebd42fa5b---58791977184.pdf In PDF document text
    • http://candientu24h.vn/webroot/img/files/darukofusis.pdfIn PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/48b5ed1c4c50fa40fad920052764089a/25419843753.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/muwepereridipe.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/a66783b5f561b95732da7428da56c3cf/bobixiwe.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/6g8rl2felokqt1hpdd1f36u96p/muxefumisomaniri.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8b214e30d---poluvamirufep.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/suvuvizubilosowuxoli.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/abrobuetibajbu707g702d3ki1/85303000356.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/8887460219.pdfIn PDF document text
    • https://aurorabersinar2.com/contents//files/43282386247.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/tepinolejozaximivo.pdfIn PDF document text
    • http://sepremprod.fr/www/images/mediamanager/29903419730.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/52318713145.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb1a6ba170---63348905850.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160853ae27fb7a---fimiwapojarizuz.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/mexatoxidupozani.pdfIn PDF document text
    • http://strandedtattoo.net/file/xamiwunigadonogi.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe935cd495---38050260937.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/4392096157.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/kiuollrf3nm565beqvkp180h17/kiwinuzafepefuxixenexe.pdfIn PDF document text
    • http://wchs67.com/clients/f/fd/fd50fd9748f3592dabdfdad26f378f15/File/49903203757.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/asjvocj9o53snsa8k82klg84qp/4189628958.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/kinugafirimezimaponi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+tame+a+dragon+in+rlcraftPDF 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_off000121f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A03 19992 bytes
SHA-256: cfff1d1ebd16a31ebe162ad756ed7416d117957755f657bdf16927d174a89bbb
font_02_sfnt_off00016d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D89 10728 bytes
SHA-256: 44b347d7bc76aa75982d2b1a7bdfdc92f3f222f9f96742258fb5e957326fcbbb