Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7226f7f558411fc…

MALICIOUS

PDF

81.3 KB Created: 2021-09-09 09:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ee3eaf9d312c2bbe3c2640df6dabdeaa SHA-1: f8c56141307bd8ed5f420d7278ea31baf0f30140 SHA-256: a7226f7f558411fcaf522c4cae9f0a98958cea6ff8cd2751e55aacad6afc4ad5
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 WordPress upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa85b56842---43801995767.pdf In PDF document text
    • https://cancelaria.pl/galeria/file/kigowoguxeremegudafuv.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/riwelijonejifazow.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/91371467325.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/74670478390.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/40988606306.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/12345113020.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/sefos.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/gafatos.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/68122644406.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/51978248604.pdfIn PDF document text
    • http://geyuping.com/geyuping/uploadfile/file/2021090114000173499.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/55826779180.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/92418690483.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/birafezepewilide.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/50869342846.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/gamuze.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/dadejaxodaxaxini.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/73036123858.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613992cce06da---nitudotetafafe.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210909062017_c774j1.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/nunazorelubaboki.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/76952469144.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/13853426655.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/5571623364.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131821caf00f---takanug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=t+mobile+data+not+working+iphonePDF 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_off0000d5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ede0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE0 10952 bytes
SHA-256: 097014e27d23cfe9d9384beeb93f1167a747abefcf0f281dfd111e45f66f68aa
font_02_sfnt_off0001069e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069E 19004 bytes
SHA-256: e6212cdbb6cdade6d0e4bc8fbc411f08de847c5cc7525c8cb74f203aed7e22ff

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