Malicious PDF — malware analysis report

Static analysis result for SHA-256 a71970668e3ef7f6…

MALICIOUS

PDF

82.3 KB Created: 2021-09-08 04:37:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8326b3bf20bf8cead514217100fc2844 SHA-1: 09a1ee83c31e4460ac49ae3cfcff6a2ac37167aa SHA-256: a71970668e3ef7f664cbfc85fc95ef03c60dcf40d1ba97cacf70fb3d72a0e86e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 external resources, some of which are hosted on compromised CMS upload directories. The primary purpose appears to be directing users to potentially malicious content or phishing sites through these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/4rp67fkop9t1t879g1176bus85/kurira.pdf In PDF document text
    • http://keyflounge.nl/userfiles/file/30467919176.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/zisusipezokoxozefirer.pdfIn PDF document text
    • http://tulga.ru/editor/files/17126341240.pdfIn PDF document text
    • https://datajournonepal.org/files/zadepefirufutezum.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/ec5d1a9d3df930ef19c914af6665f8cc/5417951868.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/berolamilukovakumopojav.pdfIn PDF document text
    • https://85097781.com/upload/files/lududovovobinupan.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a95d3b7d467---sekupatazufiketudalu.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/abkd307pilkm4rm9oefiojrm60/gogef.pdfIn PDF document text
    • https://carlojans.com/cms/file/72666615605.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3d0f0feba---19250460823.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16083958958062---fupokujanonegu.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/34a2089a26005ce85763c8d0cc507b90/9707783665.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/mhdl6v03d3mnv59au283bbu7j3/xinuvoxagideb.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/6d26dljef2bai9k0tjm4jjs7qb/momurire.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddcadbc945e---rizuletutifidezap.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/visanote.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a331877a23---nerifenatama.pdfIn PDF document text
    • https://tigapilar.com/upload/files/52278483619.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/r4f5f6496h3ge5np7199ih9es0/wonafizaperovatafebipe.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bhuob0m12bd2p0k708srrpelq3/54147541671.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/tupakifutepike.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=two+step+equations+integers+worksheet+answer+key+mathx.netPDF 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_off0000d72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72F 11324 bytes
SHA-256: 19c5b5636abee7bd0b62cf5c481e30e243bd1f5f7b35fb044ab515a78f30dd90
font_01_sfnt_off0000f172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF172 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10984 18924 bytes
SHA-256: 2a2836bdae9ef2aad2440921819f974d24bb0d81c7a32a5b8bac9bc92b0b43c4

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