Malicious PDF — malware analysis report

Static analysis result for SHA-256 adfea5cebb7aca5d…

MALICIOUS

PDF

78.8 KB Created: 2021-09-08 15:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c16a2dc4d8b59d63865374b93dd970b6 SHA-1: 33876faffd915694fb13b400743a934cf3bf4838 SHA-256: adfea5cebb7aca5d7d423b407ea476986ff6c2e7e901391aa7d0892df68e97a9
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests a malicious intent to host or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://unitytradefze.com/ckfinder/userfiles/files/50700218712.pdf In PDF document text
    • https://kiptep.ru/file/kofusabuborikarog.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/32580121360.pdfIn PDF document text
    • http://kodcomputers.ro/2664/uploads/38746385845.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/71784421165.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/37004558734.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210905_264E9382928729C6.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/47068573955.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/23524835476.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/73023804399.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/44852456679.pdfIn PDF document text
    • http://valeneighbors.com/userimages/gojakakokosajojod.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/92f82419e3fb334a7f877e012e79dd08/1862266575.pdfIn PDF document text
    • https://stvorki.ru/files/file/zasunabodozoleroriridadoz.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/rugijirewe.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/53364394427.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613510288d201---29995991927.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/potumemuziniwe.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/zakodujuxatojadewew.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/5e2fc810ffdbe535ac582feb2be05328/91766379977.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/54753441896.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=tata+cara+sholat+jenazah+dan+bacaanya+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_off0000c8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A1 19400 bytes
SHA-256: f55b5ca32e054af66b6e72df78974c45ccab35dfb4036899c2fe8e6a18e54650
font_01_sfnt_off0000fbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAA 11032 bytes
SHA-256: 61e5760bb3297e6209f95a3d1f6b092f33df13820da5e50cff71bb9b37004b35
font_02_sfnt_off0001152d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1