Malicious PDF — malware analysis report

Static analysis result for SHA-256 2658f86bb86bc6d1…

MALICIOUS

PDF

70.7 KB Created: 2021-09-10 05:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 363fa17875292ea8c21fb39bf4f481d1 SHA-1: d9ffcc33f77416039807d971aab5879f63b3ce5b SHA-256: 2658f86bb86bc6d196f801c9f35176e49c99aee868a7591827f8e79f934f9c9e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting it is part of a phishing or malware distribution campaign. The embedded URLs likely lead to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161322f6a7405b---nujigodakabexo.pdf In PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131aa7a55252---26794667773.pdfIn PDF document text
    • https://t2sc.me/userfiles/dibisanabebuxufimir.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/88341996037.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210910081955.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/46047216302.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/rolesivakimof.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/24035129888.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-1/20210901105426436220.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/93b1c3d08a70538306510724789f3a0d/sujotisawujejolab.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/givokasujuxivureguwi.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/gibatipoduganet.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109030905031851.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/kewidiludunarodogi.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/48240678697.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/pimivif.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/78009175942.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/dinijiluwelovozamifazetij.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/22844041461.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1631161745.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/44943420846.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210908132743657080.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/76344565225.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/zeguroxazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+unroot+with+kingrootPDF 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_off0000b55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD73 10148 bytes
SHA-256: 4b1cf75ca8c3a8c7da2a5921ce678f95da6c12151ffced0f424e2eb64ef928de
font_02_sfnt_off0000e405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE405 16060 bytes
SHA-256: 9721e9f7bec463f685d79b60b4b01c96d68976624562906e4ebc766d1bb38ee6

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