Malicious PDF — malware analysis report

Static analysis result for SHA-256 9423186d88e3c572…

MALICIOUS

PDF

75.7 KB Created: 2021-09-15 17:36:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 17b964beaa042325de83453ec5114f9b SHA-1: 3e26bf9b56199b23ac184ae5e4e6b17f52217f47 SHA-256: 9423186d88e3c5726b7d5ccac6eb23db72dfc3a225860fa5561e0814d063e108
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to lure users to external content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://dermalab.pl/userfiles/file/46709490751.pdf In PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/32788731244.pdfIn PDF document text
    • http://balalajka.nu/media/mabasoxoxevaxebiwelovifug.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/94596566759.pdfIn PDF document text
    • http://fteq.ru/files/file/37282195151.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3097adebb---71637379281.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/wiluzafiwuxuxamu.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/8809451967.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/91915094280.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/tinirasebupi.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/2c3dce070e251c8c44761f84b54ad000/tosijimuw.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbf18f1dc1---70754109898.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/mirawuxapoxutumumaxatifal.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210903144418.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614126bba217c---99474369661.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/99065634208.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/3356077538ad3b01ef06d0aa0cc9763e/gedavomakikerebeda.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/razofuxazamebenut.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/48381675256.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/83254891717.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135067dbc0a3---vunimuwenopoxabigosonifow.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/ruzitukememuj.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/78591056466.pdfIn PDF document text
    • http://anpo.vn/upload/files/62200870029.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/rituzaxapenebadif.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/39920233425.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=download+movies+from+123movies+onlinePDF 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_off0000c26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC26A 17204 bytes
SHA-256: c4533779936e844931512d52cb2552fd121194e15ab9c90a95df2b337369d245
font_01_sfnt_off0000ef0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0D 10912 bytes
SHA-256: 915c2cf9295cd8733d9e05634ff23cd022f2c333c061be348d76caef9eaa35e7
font_02_sfnt_off0001086e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1