Malicious PDF — malware analysis report

Static analysis result for SHA-256 2375202ff577b86d…

MALICIOUS

PDF

93.2 KB Created: 2021-08-10 04:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: be7f87481494e34cfca0806208bff84a SHA-1: 46d9f498b0d2bb02a88c0bc352516e7dbb08e7b3 SHA-256: 2375202ff577b86df130fd333322ebd62b9b185e6a2e16c889849afcb98a44ff
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed for malicious redirection. ClamAV detected this file as a phishing trojan, and the ML classifier also flagged it as malicious. The embedded links suggest an attempt to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://sbsoftware.ro/admin/userfiles/file/bufelusonidudivesesij.pdf In PDF document text
    • http://constantcontinuity.com/membership/data//files/39186382535.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/a99e69cd22860f81b88816cbd6adecef/lobabizawebavoxexi.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/sakezalivi.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc32fc1e8c0---49087091621.pdfIn PDF document text
    • http://scro.ru/pic/file/wobesiguka.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a44932656---84522904448.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/df1fdfb9ffbcc417806a316bda9c4b68/57352958777.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/11d08b6dba9bddf2f907c2c07470b141/34144872312.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b42b26efac---mirozovetogafumu.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a45768d16---10876471598.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/3659871616.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/pijadirasenogov.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/124748121.pdfIn PDF document text
    • http://starrsgazette.com/admin/images/file/43735994730.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160803ee0aa55d---jufixonaxixijelimuxud.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/limosebenifofewafojajizib.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/6hb7r2pvfodm35rjq6qg8oniqv/7420011745.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/12032583029.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/tifopigulujigute.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce3dda8066---67372422551.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/gapareruxufuza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=is+4th+generation+echo+dot+betterPDF 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_off0001081e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12035 10772 bytes
SHA-256: c8c973ded9e9c4674328c0aea1020a5f45abce988c53bd8e246c77929c47da90
font_02_sfnt_off000138c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C3 16788 bytes
SHA-256: 2fcf756c27ec1bb1104261130385257b1aaf6756438788bcf7a5b1dadf69fb21

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