Malicious PDF — malware analysis report

Static analysis result for SHA-256 24693c6cec19a78d…

MALICIOUS

PDF

80.8 KB Created: 2021-09-02 19:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ff7f55bfc6d53e2595887ccbe77ada72 SHA-1: bd3a2719ce175b3f7fa5b9ed51606558204c275f SHA-256: 24693c6cec19a78d640cc0bf005a9d4763e101e5e876706bcbc8369266cb6534
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, many hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://newtech-utm.pl/userfiles/file/63682451298.pdf In PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611010785bc2c---96774578333.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/67650133279.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/59838438143.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608060463039d---51034093953.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/97164751430.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/45759512649.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/90251603755.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c187977e0ae---54783207207.pdfIn PDF document text
    • http://redtopmarina.com/clients/7/72/7297c65379f6126c97b8b18e62fd1dd4/File/watekenenomupokogol.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/77711248629.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/84956289945.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/26032469451.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/91470296451.pdfIn PDF document text
    • http://alltechsro.cz/files/86504831951.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/jusuxemu.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/f21fab02bd3716c43a5d7b84402fd891/1299595280.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/gidareka.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e3cd5c98007---9461215367.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b5f7147e8---44664642331.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/83445717936.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/e2044f088f95366467d5148e40acd58a/34619428674.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/zowebudoxiwunuropiv.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/nelup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=boxing+heavy+bag+workout+pdfPDF 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_off0000d67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE95 11316 bytes
SHA-256: 7592ad3e4f3a5cb481fad6a99aa69890dd7228b8721588f5885ce0156a38c88f
font_02_sfnt_off000108d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D7 17604 bytes
SHA-256: 6e3d280cf955740515b6a7ba31bbe5db81289f6a1c3966ce9ea2dcf05a7d202d