Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a4cb0981b7e9f0b…

MALICIOUS

PDF

90.7 KB Created: 2021-08-02 15:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dfe6171325a92fbdcd99862f7c71070e SHA-1: fa6e0147c6fbb0986767881acc48c1e384b72ca7 SHA-256: 4a4cb0981b7e9f0bef638f317a03d6bcca33a739226b8d55e23732642d11d282
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of these links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/ae0d913b6ec57546fd85ad8c344659ea/57851495208.pdf In PDF document text
    • http://novussiteyonetimi.com/uploads/file/46008114014.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a0380d57d---pasuwonat.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/podofisezapotekenoxukodud.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/0ccdd5bf78511d373ee4a3c53af9ad0f/werozaf.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/90bff947b00b9ef7b82c65125da696e0/wimizefamap.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/xebemapufiwefedofubosi.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/86f39aeb7a7fcbf29df5420acf5dbb5a/zisupowisaguz.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/1688250118.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/b458e508042c5a6d341caf507fd02efb/44182195037.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/zusigomekilejimimutula.pdfIn PDF document text
    • http://labsshop.com/d/files/zuwivegikemexenol.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/narogivupidutepikawum.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160703baa95c09---kapuwe.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/40221929368.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17e09668bd---8553794982.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/zaboxafasoxujido.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/kuzun.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/de1d7853f82c415431cb1f56156651cd/53029551833.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/faa3de825d48a41eab6f825c7596af77/xepidubewazagirupax.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bvtnmu4t9h7iaie6ja8rtn5sk3/10455236818.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/29655d1c3f55fbc0f3255c356fb9ee6e/76964851531.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=a+to+z+mp3+songs+free+download+for+mobilePDF 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_off0000fcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEF 11280 bytes
SHA-256: 6d430b114e2d04c79ec9b28cdddcb68d1b09b49a481e1bcbdee0eb0bda015cf2
font_01_sfnt_off0001171c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2E 17316 bytes
SHA-256: 6bb62702c194d80330798d5e76b4610be363b689e358b842d2433bb11af8e8d3

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