Malicious PDF — malware analysis report

Static analysis result for SHA-256 c88dcfc57346bede…

MALICIOUS

PDF

76.0 KB Created: 2021-09-03 02:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b7f367da3f219dc25c7fe9188d2077ac SHA-1: 0cb3b147fdb50beb28afbc971e2c5d8f748ad576 SHA-256: c88dcfc57346bede5683df2eef85490853a636a9117f7ebe01a30adf6ecdea1d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised or disposable hosting, suggesting a phishing or malware distribution lure. The PDF itself contains no readable content, but the embedded links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://maydangson.com/vietkiendo/upload/file/xupajupasasupowapuji.pdf In PDF document text
    • https://cgeminfos.ma/upload/file/poximikuzadibojenomes.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/rexugunixopekekevikenaxev.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745ea849569---wafejesitagedofikurok.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/91894250064.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/4cd8b4b87bbbc49c9352ad6abb3f681d/52262000906.pdfIn PDF document text
    • https://superpart.com/files/21795032631.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/nuwune.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/95989951471.pdfIn PDF document text
    • http://fteq.ru/files/file/butazabewexanu.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/fb621715ab202dc6dafd3218fa0c4a5f/85539160652.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8f8362999---22889697336.pdfIn PDF document text
    • https://gloriouz.in/ckfinder/userfiles/files/51444955902.pdfIn PDF document text
    • http://skomi.ru/img/files/file/giduvuwavixi.pdfIn PDF document text
    • https://castel.ro/userfiles/file/76736500021.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/6n5ah4dk2gmtvgqe10j4s8tvin/febepexilavijiwubew.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863cd5e946c---xidatunojiro.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160dd7563559d8---76790428929.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/dogoremuwe.pdfIn PDF document text
    • http://camonetinternational.com/files/file/zazaziximadimozid.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/3706690980.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f13a083e6e---vuwujinefesami.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/91130697081.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=irganox+1035+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_off0000c107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC107 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91E 10672 bytes
SHA-256: db7349b233a38d252e49a846b24cce5bce49b63774b13475e9c328b590fcbbb5
font_02_sfnt_off0000f171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF171 18708 bytes
SHA-256: 66b82a3c069026cff07d82fe419117bb76905c45163719f515aafef9aad67c2e

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