Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0ded6c7e23be336…

MALICIOUS

PDF

80.4 KB Created: 2021-09-12 05:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 725104d38028bb3f7ee4dffb18340569 SHA-1: 43062049a4aaf2e4322ce4cb0f5d72e4b598d97f SHA-256: c0ded6c7e23be336d1cf8e32fbe53863047161508b9a9499b2bea7d36b476f33
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites or disposable domains. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

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://zeminyerkaplama.com/upload/ckfinder/files/58698989158.pdf In PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/pivololibife.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/10027613161.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/27658169276.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210905_050224.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210910/1930573589.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/74687160029.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/pebatazuzobufimanezepepip.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/vobadikejabis.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/1b1366d78d2528bbfac0c16a0dd55692/tikiken.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131d4dad99eb---wesodoriwututefusolonorig.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/wakebisat.pdfIn PDF document text
    • http://humanlitech.com/files/files/finagasekiw.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/mopudoniwifozirin.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/dobenowevobowasimopurewup.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210903222609.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/11058785064.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/rivijivavupodi.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/16961625922.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/35200933002.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/fesixagolisobinawadapoda.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/37692534563.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/30856212126.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/o05k5tlb4gnmneutmpkbnr18ef/74992878691.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/zawususakokutidiru.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/remakozigokitiniwepemug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=hunger+games+mockingjay+read+onlinePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#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_off0000dbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF5 11040 bytes
SHA-256: e1e5bb12844d4a24cfa1522f31ae1222211c096a4cac7ecf4ad41e657c4fea6a
font_01_sfnt_off0000f555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF555 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D67 17352 bytes
SHA-256: e436d1e0509812da3432d2ccfc118b392d136e9c0c306d3e9f7b9f540646be46

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