Malicious PDF — malware analysis report

Static analysis result for SHA-256 20dc427f04d076a4…

MALICIOUS

PDF

83.1 KB Created: 2021-07-07 02:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 4b3811f57b28eefdf3605207015b310a SHA-1: f6d1ba1447a50cc06f68a30d5a7b4ea344cea5b2 SHA-256: 20dc427f04d076a46efecb5a71d2099b7a0a6ac78b19224651cff93a045f71ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or redirection scheme. The presence of embedded URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support the attack pattern of luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://coretry.ru/uplcv?utm_term=ui+cheat+extension+sims+4 PDF link annotation
    • http://autoshiftbid.com/fckeditor/userfiles/file/mapanisalonidenufutabexix.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/97601598970.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/jinedapiwoburomovomekesu.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/6476003497.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/26126131372.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/59486855432.pdfIn PDF document text
    • http://coinmarketsuite.com/ckfinder/userfiles/files/32559074463.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/dosapujesuwitafad.pdfIn PDF document text
    • https://ocw.tw/uploads/files/furixerugufelaniginiloruv.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/6t49r2vbd9pvr0fjjb1scajaui/69453138831.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8925ee591a---zavowukuneduloresuxer.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/64573126254.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774a62bb9a4---ninolilagu.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608dde2ecafd4---8976985315.pdfIn PDF document text
    • http://sam-global.info/files/file/segevopamoxegusitiwo.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/39393595347.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/29b14bd5bcece7deaa94b2b3fb6e1456/51204498245.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dacdb08fb---jipitonanudunefatuw.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/26899757453.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160cfec85aee0e---1403845990.pdfIn PDF document text
    • http://changdahk.com/upload/91314803268.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/bubafowavuxebazeturew.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bf9828227---panelufutudab.pdfIn PDF document text
    • 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_off0000e633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE633 16068 bytes
SHA-256: 5b3f71178cfa5bcc43f65f1e6e793d8a51f196155b653c1858fff3d169d63a01
font_01_sfnt_off00010f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001275f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275F 10536 bytes
SHA-256: df76874675cd0b8bbb207ec405b15dcac46d1aeca29abf22b6ee24a7392950bf

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