Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1546ad3e09aa97f…

MALICIOUS

PDF

108.6 KB Created: 2021-08-01 03:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: cde1d99b7293f445779d6387664f0188 SHA-1: bc616c22053463a18ff40a0e441bd8b6815866f8 SHA-256: d1546ad3e09aa97f48ddc4dec57c8d7f17442103349ce3a9fec4bc6538d2b2de
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of numerous external URIs and link farm heuristics suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://szentimresiklos.hu/upload/file/nivaxinupogiwu.pdf In PDF document text
    • http://scpt.it/userfiles/files/xavevununonajuzaze.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/dhdsfkpjqrnmfj3jd03rd7hel4/besop.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/10920279301.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/66349315161.pdfIn PDF document text
    • http://shelton1961.com/clients/35589/File/79544498154.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/ahc5dmrl5quddrk16nc6gccgnq/gudugitamexogegigunesi.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072ae3a94575---21383722439.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/praub23i1g7s1qk5q4ov56vo9a/dunojimomumuwedanuduf.pdfIn PDF document text
    • http://ecole.ru/text/images/file/38114037503.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/tnudu0c7qpdi0gfhb9lbnr5n7d/suvetewusimasebiliferu.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0c1a1a457---mivikapipumizumav.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/30504f058b7e36d939b59ee8be7cb4f5/divizilow.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/bubinaduz.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/7132787558.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16096d9c7e8e19---88792376027.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160982ba09006c---xetajebowejuv.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/a3f661a7e7a9d549affcd2502da12129/13628403713.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/c9450a8456a09df3f4189170874c5960/18574429120.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/44831036804.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/migugiv.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c90aa981cbe---71247435187.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=american+gods+ending+season+2+explainedPDF 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_off0001406d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1406D 10964 bytes
SHA-256: de8c9889beac6def409e23f5a8cc4a86e18b50c37209e772d4e946c483249e2f
font_01_sfnt_off000159a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159A8 18544 bytes
SHA-256: 66f4025a969911ac608fe63a0a91ba15772d2a0ea0d933a608cb342966c040e1
font_02_sfnt_off00018a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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