Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b6e98bdac3ef911…

MALICIOUS

PDF

106.8 KB Created: 2021-06-08 02:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 3564079817be3094e6d118125f8c9a8c SHA-1: 1f3eb9caec16dae3096fa8acc73027297c4d66d2 SHA-256: 6b6e98bdac3ef911ddae5567ac27d97a318407f3dfe1ec68476681d5c70c219d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9626

Heuristics 5

  • 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
  • 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://synerhu.ru/uplcv?utm_term=when+calls+the+heart+s06e09+dailymotion PDF link annotation
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8de0d7b2e4---navobitositebizizedawif.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210530_016003EDD21B9BB0.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bba96665c74---pitarigajalanijewu.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/hknmh8qiida81iu3dt75n138lh/58603176456.pdfIn PDF document text
    • http://canadanur.com/resimler/files/80548150355.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/40889312061.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/28edglv9ht76ns6i68kon9us93/tevosulaputiluwiwugip.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/k7uo6epufg7fii7amovem21nu2/17203542471.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a467e636071---30591982654.pdfIn PDF document text
    • http://ibb-online.ru/f/file/bavum.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/10adc45292890cccea063457a8436edb/jikitux.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9e4c6c3f0---wunosalu.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/vowoxekumakajot.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/vpeakiiq2p78j48ggbop6be990/34872742447.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/roxoguf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000175ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175FF 5748 bytes
SHA-256: 29b76a75a94b2853c7d6060171490989851cd51e7b27384c3ba0b566d37a5fb0
font_01_sfnt_off00018970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18970 11208 bytes
SHA-256: bfbf5f267b4d34da51cdcc416793b0bb8fdea62219033800d8a5a4a70894c7c1

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