Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3546ec532fad0f6…

MALICIOUS

PDF

81.6 KB Created: 2021-09-20 23:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b730a5e50b948fdc5553a0c1713c9a8c SHA-1: 487662242ccba939848b5324ece99fce265c2a42 SHA-256: b3546ec532fad0f6e6c0d70ece41fd2afd28f50043b0ea5a67797a0d28470959
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://robbes.nl/media/files/bifulix.pdf In PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/jababof.pdfIn PDF document text
    • http://sapthagireesyathra.com/userfiles/file/66294875265.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/mesuwewijavizok.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16140ac4561f8c---texudike.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392b6aac0e6---58198011757.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/76502063743.pdfIn PDF document text
    • https://matrixx.lu/images/71291385141.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613854e779c7c---61300180336.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/38444232242.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/jarudovepimonopok.pdfIn PDF document text
    • https://karate2.cdmedia.pl/userfiles/file/63975483739.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/60334779033.pdfIn PDF document text
    • http://mcdanielz.eu/files/file/71940547992.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/32110067877.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/fenota.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/13511892374.pdfIn PDF document text
    • http://sunway.me/uploads/file/152156053947.pdfIn PDF document text
    • http://cissi.it/userfiles/files/wovexazatizatirajo.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/popubabonixusutorebosaf.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/57994079784.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/32116186568.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=online+malayalam+tv+channels+live+streamingPDF 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_off0000dc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6E 16912 bytes
SHA-256: d044cf5c2a9ca53588ff0edc5426c6a2457d4aafe972a35f076c13a618ecf725
font_01_sfnt_off00010854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10854 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001206b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206B 10760 bytes
SHA-256: 5e7c991694f416d9f59997b72a9524b3d16e8e0a4e82bae321e84a16c98176da