Malicious PDF — malware analysis report

Static analysis result for SHA-256 20e36ea2b55aa6b2…

MALICIOUS

PDF

83.6 KB Created: 2021-09-05 22:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4be51d446df61b9a6bad1509d2b38b8d SHA-1: 44557183e982edf084ca1b4257f4fb6453b26d91 SHA-256: 20e36ea2b55aa6b2011de8a5672b78eddd754fe4cab375cfed8f3d431089d85f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to potentially compromised or disposable hosting sites, likely to lure users into downloading further malware or phishing for credentials. The presence of embedded URIs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this is a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.singchai.co.th/ckfinder/userfiles/files/57490103509.pdf In PDF document text
    • http://ahxxzx.com/userfiles/202105/file/kafekebelubofejapur.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611436fa7c4b5---68126051663.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/xamoriv.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff879ea5ca---luvos.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bdac6fb30---mulusixeguwe.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/busajuvobeje.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/54529940954.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/40148528597.pdfIn PDF document text
    • https://thietkevuphong.com/uploads/image/files/vudib.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c938723048---kijolujijo.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098b1e2b2d4b---xixomesofibiseri.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/dejidoful.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/fapewivawoderek.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/83740902335.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/texelemivaledazojefuza.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/38821451326.pdfIn PDF document text
    • http://jsdarvin.com/files/83567819693.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747db742981---35094854354.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16125031bd52f7---7167936018.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/48494732719.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/tejemujowekidavivodile.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab0f8916af---78428527136.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=s%C3%A1ch+chi%E1%BA%BFn+tranh+v%C3%A0+h%C3%B2a+b%C3%ACnh+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_off0000d5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE13 11280 bytes
SHA-256: 85bb744f5ffb722580a3d445d9498be91b605c9b34fd29b51917e9c09aca9265
font_02_sfnt_off00010770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10770 28656 bytes
SHA-256: 48f41feff2943d30d827d8b7ccbb6f78c7f5f6c8601fc13d5ddab236a18335b0

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