Malicious PDF — malware analysis report

Static analysis result for SHA-256 dae8f181ad8dc6f3…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 09:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3e95199d84824fba37c6c962e79ff4aa SHA-1: 70dc645b5773bfce2c776e35e53b7a925b19416a SHA-256: dae8f181ad8dc6f31e8c0b9a0f8f54487d4f441e24b4fe246fbbe1a8ad618f12
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • 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://artsar.pl/userfiles/file/4824837799.pdf In PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/tivanu.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/v0vs4lrbeuabi27vbvk7bav3fa/78105618040.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/velorojotujeti.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/vawililuxanesotozu.pdfIn PDF document text
    • http://miydz.com/mingyi/images/userfiles/file/zisive.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/39730354404.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/sdvsulrupvrqj5udq3rrvrg6lc/98302537159.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/2747393331.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/tajubibije.pdfIn PDF document text
    • http://serting.eu/userfiles/files/99536055479.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/54306428830.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/nirekukojegevekakef.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/rukanemo.pdfIn PDF document text
    • https://indikino.com/ckfinder/userfiles/files/timipolutetajoloxudinom.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/3954132879.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/71735938682.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/mafotinuz.pdfIn PDF document text
    • https://ourguarantees.com/userfiles/file/solawasero.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/7913062365.pdfIn PDF document text
    • http://medrea.ru/upload/files/banolanarenan.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/saxanuwujorawikuvele.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/voxabajopawuvujakosu.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/qcuov5t0cs53pnqnmluqomk5v8/59871700793.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=conjuring+part+1+full+movie+in+tamilPDF 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_off0000da77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA77 17788 bytes
SHA-256: e7c42caac6705205f3a3b17251676eefebcd23a7bf14a4d8e07a98a13c1f0607
font_01_sfnt_off00010757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10757 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6E 10912 bytes
SHA-256: df8c68431958c0c6ff2aee82c0fb882d3550789b1575b40e07ee2c56f01fe1cf