Malicious PDF — malware analysis report

Static analysis result for SHA-256 f90279ff102fdcfb…

MALICIOUS

PDF

83.7 KB Created: 2021-09-02 15:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e286d31eb77d2f6ba239cd49899a2007 SHA-1: f97c012b5552eb783d8175f4c2aabae159f9d77f SHA-256: f90279ff102fdcfb389b79c415c21925fe294dcee1fec99d0fedbb62d9dc0ea8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to numerous external URLs, many hosted on potentially compromised or disposable domains. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://weingut-suppan.at/files/fazetosomuxolifojabowe.pdf In PDF document text
    • http://brandnewgoods.net/userfiles/file/norutagixi.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/dozovafetujolaluzipusonu.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/6392566478.pdfIn PDF document text
    • http://kientrucqhouse.com/uploads/image/files/5507144977.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/54515660829.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/16937434593.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/xexezixarone.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077ea9a33a22---44667782608.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/6od5ocdonrj4g6ifflmrg8tukt/vukisaxodilefudixeju.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160c43b1e7ab8d---78357775542.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/61715965095.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c410dd02f87---gojefumuxesoz.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/m586ecctellp95kvd2s2jamtal/gimivanivi.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/85327636961.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc74bb20f8---jujefipid.pdfIn PDF document text
    • http://bogieclassof67.com/clients/71235/File/zasolarelexoboturatojido.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/c277f8a7312f0e22d3458495a480cf96/sevologujaduko.pdfIn PDF document text
    • http://momsystem.ru/public/file/48090267774.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/efksfasdvdstkvqn1iilqi1v2n/94453840970.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/84804963266.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160848ed12e6d4---xodotexebapurobuguzopoxaw.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/dulajugiwugebofedaleropu.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/fiminirozomoja.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/8908980057.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/97510262749.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16085259c595dc---ravej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=diff%C3%A9rence+entre+moteur+%C3%A0+courant+continu+et+alternatif+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_off0000dae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE2 11052 bytes
SHA-256: 854fd4452331ac817eed8bf69307dc93e91c9914c7ed08e0e1425ec12f48ee49
font_01_sfnt_off0000f3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF0 19840 bytes
SHA-256: b0b12f45a9e025018bc815e20e05ba507f2400451354d23ac70866c679d59efa