Malicious PDF — malware analysis report

Static analysis result for SHA-256 020f81a71a20fa01…

MALICIOUS

PDF

75.9 KB Created: 2021-09-12 20:30:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fc19548a20a4ed94349d05e7f0afe5ff SHA-1: baeb05b42cf5481249bf433f6fea0de4a97d5ae8 SHA-256: 020f81a71a20fa01a5c9d14e77324a8540d09645655abe6a8728574301822078
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream 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 ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to phishing or malware sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://digireg.ch/upload/xujanolavuge.pdf In PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/ef5fb4ff8fd9f207f364953054a0dfc9/ginedofew.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/vexaw.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/lidevefukamu.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/viwujofukokidosav.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/76762221073.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/latobezipotolonor.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/92110095027.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021090502254194.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/rawapodo.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/dizogovulurigupamoxoxopop.pdfIn PDF document text
    • http://trivio.it/userfiles/files/zukotitapatobujojiveku.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/mamekot.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/fozefoxujezufijotuludeduz.pdfIn PDF document text
    • http://15881588.com/ckupload/files/30919005572.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/19100976465.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133823d8746d---714508763.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20219111727141621.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/uatanj7rup0fvc517hl52gd5eg/vakexopaxametololod.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/sl2e2a3oiefcki1tcatj65dqc0/dibozorofevumumetawiwa.pdfIn PDF document text
    • https://www.algeos.com/js/ckfinder/userfiles/files/60550661094.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=free+instagram+likes+trial+famoidPDF 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_off0000c5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B6 10764 bytes
SHA-256: 171d8c2eea7572a768f1124c6e69137e6478677b5e4b5f14f813875d264a75a3
font_01_sfnt_off0000de3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64F 16808 bytes
SHA-256: 0261952fc28dbd8382b0ccf326a0e16999e75e30a1d02ff65ef1d743580156bd