Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf0cda3c7d4fa094…

MALICIOUS

PDF

73.6 KB Created: 2021-09-15 23:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 0f38c38d389e9590beb87f906b766df7 SHA-1: 1daa16b4d557603ba804677e7cbda3bc5673b50c SHA-256: cf0cda3c7d4fa094c55587673e27151e4460b8940dab237165ec8c68fc81a15a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pustelnik-budownictwo.pl/ckfinder/userfiles/files/lomulem.pdf In PDF document text
    • https://best-label.com/upload/files/42364225810.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/8311734963.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134929dacd81---11719279699.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/44506606280.pdfIn PDF document text
    • http://paradoxine.com/upload/files/95276535710.pdfIn PDF document text
    • http://serting.eu/userfiles/files/zunoxesawurugopa.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/zilotokulu.pdfIn PDF document text
    • https://invision.buzyhub.com/files/74074700752.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/nijurekunufadib.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/9900381553.pdfIn PDF document text
    • http://receptlap.hu/files/43595720449.pdfIn PDF document text
    • http://nawarashop.com/phya/ckfinder/userfiles/files/zejujevimaf.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/35063636547.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/wefawinazuxedunudumotapip.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/a5539de3f9445d875ca32ce95d853187/72856227506.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/17410430485.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/6188930314.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/22940123098.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/35654594229.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/30725894303.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/valizodid.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c04cd9a7de---siwixiwavamikasomo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=peter%27s+friends+watch+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_off0000bdaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDAA 16696 bytes
SHA-256: 1387d5be8a71b3d264364a33803d8bcfc8a1cce1ae7d0b99e0951f0c24859d72
font_01_sfnt_off0000e883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE883 10696 bytes
SHA-256: cdb6aac3b6646c9e1272778c9f1ddfc89561e9d589628ab54beef97d74035b79
font_02_sfnt_off0001011d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1