Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6dea659dd326187…

MALICIOUS

PDF

71.9 KB Created: 2021-09-06 08:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 40d25d950319173659e5a7048916d4ff SHA-1: 4db16597dcd91b94133e1b8c79a12dfc483dd574 SHA-256: c6dea659dd326187a9034702b38ebceaee833cf065e9677e4f49deacf2bd113a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://christopherdallo.com/file/kafofoxel.pdf In PDF document text
    • http://optikametuje.cz/userfiles/file/78237920645.pdfIn PDF document text
    • http://cl-pub.com/files/files/matosodubiragoke.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c01b088beb1---10500438257.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/52195600863.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/47601940555.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/bujakisutasezijibezate.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078f10582248---32260404001.pdfIn PDF document text
    • http://yilip.net/userData/board/file/74530124190.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/72248562265.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/41474416007.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075906052112---xaboj.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb564143f9---50232258646.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612c79b28a8a2---1834565135.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/15553685779.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16070c3302aa24---46016999676.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/patuzajarigizizasena.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/5508042229.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/nonuga.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3f5b715ef---64803675737.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/0e6427d3cd5349b683c4aec3ecd68d3f/zamabenidetefizavalupaje.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/74555606599.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=google+academico+tesis+pdfPDF 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_off0000b7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B4 16356 bytes
SHA-256: d15af9949552df782fbb1802a3d8c105e8fe338883e16688a07f90a9d4a5f15a
font_01_sfnt_off0000e159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE159 10800 bytes
SHA-256: 52bdc5a3c22ea61e11d5ac5a9680a727776f5007621054f88ba3eeb5b5be1ab3
font_02_sfnt_off0000fa19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.