Malicious PDF — malware analysis report

Static analysis result for SHA-256 6202ea75fbc5f019…

MALICIOUS

PDF

87.5 KB Created: 2021-09-04 05:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a32492d017f6758e62caa37387188376 SHA-1: b8184c2019fb3017712c14d94a71c431eb2171ca SHA-256: 6202ea75fbc5f0193562b8ac3e340f79302f62e593bfbfb7b4a7b6dd2a26c2d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a phishing or link farm distribution scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://catamma.ru/uplcv?utm_term=counter+discourse+pdf PDF link annotation
    • http://flygarfield.net/userfiles/file/81871291039.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/5nag5qvk99q057bharb89isqs1/9493272665.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/nugewuwifuregakeverikux.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd4f713bab---52361328871.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/65a35f0ac62c336880b31a5856417315/65759585519.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/51731593064.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735b15072e3---riboxukabugivimedit.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/161028ee177e0f---rulefujusevax.pdfIn PDF document text
    • https://kaisar168.com/contents//files/zibakifotudirowixusovulus.pdfIn PDF document text
    • https://seikai.jp/free_images/files/99257339029.pdfIn PDF document text
    • https://bio86.net/fichiers/gevorofegime.pdfIn PDF document text
    • http://peak-experience-japan.com/2054238010.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/punarifibesotenu.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/48342728187.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/pilugitekipolunudun.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2d586cd14---mexovo.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/64315751482.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/57670749779.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/90498584059.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/87503837593.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/12336692111.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16081a522c18d0---87350316372.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/f0cbc83b34c02abdcdbcf381c94dc7b5/94905877168.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/bafulezopemuzala.pdfIn 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://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_off0000f01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001082d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082D 18168 bytes
SHA-256: ab0a60bb25a9f81230b0cac7f37650870cade5c81cefe93f95ca77eba3973960
font_02_sfnt_off0001377d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1377D 10536 bytes
SHA-256: 625f6df5b141e811c0403b14dc6449c3355a69afadac22066e793d25a7af945a

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