Malicious PDF — malware analysis report

Static analysis result for SHA-256 6502ea0e5e4b2202…

MALICIOUS

PDF

83.6 KB Created: 2021-09-22 20:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6e056e228f03057e35d0028d5adb0e06 SHA-1: df5b301192f8d317e6c77317a8465915562fef2c SHA-256: 6502ea0e5e4b22024c72667c7ac10f72b448b9b56054ccb19a97ec520d1eac79
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of numerous unknown URLs indicates a broad effort to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/67be44eaef96eb5057060e25a86daf5f/86629678444.pdf In PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/76601010166.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16144d99176622---pipibodatewifubob.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/vebik.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/9376113529.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613750d8d2eb1---gaxubebojivudajosilokowop.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/zibazolojuxaxanasusavu.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/3c404df43297dad49fe0bc7c2b1a3a92/xijexekikesob.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/83705547016.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/liwufomofusomep.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/28975944435.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/xazixevun.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/83104183665.pdfIn PDF document text
    • http://galaxytraining.examinationonline.com/files/nuzazuvosepir.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/jenanupogavukigekobofodox.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210902_1F670DB56757E6FB.pdfIn PDF document text
    • http://rs-entp.com/upload/file/41686461024.pdfIn PDF document text
    • http://rsentco.com/upload/file/73114154631.pdfIn PDF document text
    • https://longhoang.vn/upload/files/bezusogidozezogopat.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/75464179482.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614445eccf891---7816726682.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/zajizokozolorugobunino.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/golasijememumifozifi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=hero+film+full+hdPDF 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_off0000e33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33C 10176 bytes
SHA-256: 60496c2cd46a21afc4dca464522cfe2693b0f215e3b9b3d148e50e0c33eabb0f
font_01_sfnt_off0000f9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DE 18128 bytes
SHA-256: 0755c28932ecd28d11e599e2c6352491c962570747ec7fdd79a3f44cf0c2b06d
font_02_sfnt_off0001291b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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