Malicious PDF — malware analysis report

Static analysis result for SHA-256 c06ccc4f568bba66…

MALICIOUS

PDF

74.6 KB Created: 2021-06-21 06:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 89d1555c0ea2519e43c2d08ed35104ac SHA-1: 3382baec89bb66e800c4e67b13fae441d92ca144 SHA-256: c06ccc4f568bba661836cb631482627367e507c5f8d6bf542e0455f7a49beaf2
156 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 0.9998

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 https://nomylo.ru/uplcv?utm_term=singular+and+plural+nouns+exercise+pdf PDF link annotation
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/usj1h5g20m3jkdelafre07uf57/34365224772.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/b69fee92f2c37fdb66f6f76169daada2/21713361335.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210608_071242.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/45515210533.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/9311381902.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/mdqee0g52kmlad7pddgmvv8cu3/75001003071.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/bhngfckcsel2c6oh6tkj84rm7h/babarififajen.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bacc6b9466c---11756477114.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/vh55qs0hljr9g2bbtoe53u2a45/75124365325.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/72058415247.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080966d702a5---daketobujo.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608411457fde9---pimazidutetatusulemu.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/bftqrm804id4oramc5u7rdg113/xesosipevu.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/vizawufijije.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/riqhn55jsdnf3h8kgrnlimgiu4/73180476402.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c64f4daf8a9---zegiboraba.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/vopipafuzepuvaxuzigogopu.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/lamisavefikekilipa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CA 5296 bytes
SHA-256: 562bb9032208ffead7d9a0c40e7766ffbbf707fb9af2a3d0aaffbc677d846956
font_01_sfnt_off0000e8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CF 10588 bytes
SHA-256: f953c1e416d405ab36dd488699104535389f12b6a605c20a1ee13c2e7d4d7bde
font_02_sfnt_off00010d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D31 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3