Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0bf77f0bb6ad8f8…

MALICIOUS

PDF

70.0 KB Created: 2021-09-28 13:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eb38e8b1333ef8546ff47c19b40be1bd SHA-1: fbf37316398349003b8a02b98f5cb13ca3cb3d21 SHA-256: e0bf77f0bb6ad8f89f95add6667afcdc7ff4ad718269400b489ee23dfa4c577c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious actions. This script likely redirects the user to external URLs, as indicated by the numerous PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://impeka.lt/components/com_mijoshop/opencart/image/data/files/54939366998.pdf In PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/a27c8420902b4c145694bfc55026464b/63475293457.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/xitobabusexukemowir.pdfIn PDF document text
    • https://kaparatt.com/images/File/82947604412.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336e99eef41---garibofofor.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/26355377258.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/2061110635.pdfIn PDF document text
    • http://tuzy.pl/Upload/file/satogutotinaw.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/nesirasuvixatos.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/69256123222.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/reseraw.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/tuwatedefepekadefozijavub.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/82548443703.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/06q0vnrtnmrhcfebn1p7i1s7k4/95238011604.pdfIn PDF document text
    • https://earthchallenge.be/sites/default/imageuser/file/wasorufivigu.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/porakamosesifalos.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/lazoro.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///94485471588.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/12847566347.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/70501525849.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=ac+market+apk+4.2+6PDF 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_off0000ae8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE8B 17032 bytes
SHA-256: 83f2da344b0ebca8a7bd1ef1621f9e87a46af6c244d275a9837bbe6d50292315
font_01_sfnt_off0000da77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28E 10508 bytes
SHA-256: 57258c9a4409f7be45c2b810460989d7e03f6e6da9ff78288c70341348222422