Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c6d26a465eb16f…

MALICIOUS

PDF

83.1 KB Created: 2021-09-22 15:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9e80bb69ffb13bd392f05ff4b689bff3 SHA-1: 9fe8808ac2299d0098fe0297f48d4890433ef435 SHA-256: 90c6d26a465eb16feb4cef8f176b27417bb6e3791305865e6531f4a1c9c7a771
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple compromised websites and disposable hosting, suggesting an attempt to distribute malicious content or phish for information. The presence of multiple unknown URLs indicates a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/4c0csuf1iduefut6lrteru9ul4/64854271872.pdf In PDF document text
    • http://kd-council.com/upfile/files/poloxu.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614676a8e82e0---fisuwelujijobater.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3053f2d8d---bagowekuwug.pdfIn PDF document text
    • http://umhouses.com/uploads/files/kipajumogemomulalaref.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/livikisozabijutizivanoti.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/pemadafaruzimibo.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/ae9d8b6c75467921e55a95f1d278cbae/53213780448.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109021633543001.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/bilobibajazad.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/pufudoxusikefojumari.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/91626014026.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/tagogenizilananejalemexa.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/zasex.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/zonaxemetapuzo.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/37471666731.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/tagokamotitud.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/39646334543.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/38710033897.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/birimivodemazogatuma.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/40618905683.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/90124889410.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+install+adbPDF 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_off0000e3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FB 17244 bytes
SHA-256: 082c46a5eba31eaecdd5725f16575207310f525ed4c714a5e44faf39596250b5
font_01_sfnt_off0001104e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104E 10224 bytes
SHA-256: 0f44c04fd688aeac02f44cd331f51fc661d7cde370194be57719f3c06b5f6cc0
font_02_sfnt_off0001275a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1