Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb0cf2b04062f0d5…

MALICIOUS

PDF

83.9 KB Created: 2021-09-09 09:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cdc5550fae584842a4686d8432df142b SHA-1: d450f7635248d41e3c5f7ee82752fb9a33a0dfdf SHA-256: eb0cf2b04062f0d59811b22d126d85dd19284a6241d780481fac4dcc2c77d368
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. It also exhibits characteristics of a link farm, with numerous URLs pointing to external sites, some hosted on compromised CMS uploads. The embedded JavaScript and the nature of the URLs suggest an intent to redirect the user to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://catamma.ru/uplcv?utm_term=how+do+you+earn+pokecoins
    • http://daisin1977.com/js/upload/files/90561303761.pdf
    • https://bluetact.com/ckfinder/userfiles/files/86075922011.pdf
    • http://chinalabware.es/d/files/21244113801.pdf
    • http://www.larucheapain.fr/ljk/file/tuzadaveturoberarad.pdf
    • http://montesantangelo.it/files/files/9736982905.pdf
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/tizerebixozir.pdf
    • https://jackinthegym.com/uploads/files/202109060705455744.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396c5590dce---vixusukekakadalugoki.pdf
    • https://jkmart.net/FCKFiles/File/29151012449.pdf
    • http://ajarnveerapong.com/UserFiles/file/95546945800.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/um09s50mvkhlqvd6u407hpo4h9/soxawanebapagufoforude.pdf
    • http://currycornersugarland.com/admin/images/file/sanulelef.pdf
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/liwovafod.pdf
    • http://zafirkort.com/uploads/files/41516395127.pdf
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/27271116204.pdf
    • https://davnosti.ru/upload/76615295967.pdf
    • https://adrfarysz.pl/userfiles/file/budefunopexafazisa.pdf
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/20483740117.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/1c4353c24542e0fe8443838a53ff3aed/52574730317.pdf
    • http://htwy.com/upload/file/zepopuverapuvibuverifi.pdf
    • http://vector-luczak.pl/new/fck_user_files/file/retojuwivizom.pdf
    • https://ikansambel.com/contents/files/61774800825.pdf
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/fiboxokires.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161383391de020---retupujogizetusametuja.pdf
    • http://z-sinpro.com/upload/files/58132424308.pdf
    • https://seedcambodia.org/htdocs/cljr/data/files/5934837205.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2e9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E9 16792 bytes
font_01_sfnt_off0000fb00.bin
a057935ab3dea779eb3db02464636e72514769cc4961cd025efd6a895306e026
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB00 10744 bytes
font_02_sfnt_off000113d2.bin
8302abc9400fccb0a2a6a3337c0e5c57480e513c531dbb4f39d46b9b2206daf6
pdf-font-stream PDF embedded font (sfnt) at offset 0x113D2 17920 bytes