Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ec1501b58d1cda1…

MALICIOUS

PDF

76.0 KB Created: 2021-09-08 09:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1473a10ded3211eb06e31f38406b0672 SHA-1: e6ab78005487f770fde0d9a3f3546946b8f688d1 SHA-256: 7ec1501b58d1cda17ffd1e17883f5fcd63f1a137bc890fea7eaed0a55e0dae37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/4420ec7642f6c595c420418aac61c2cf/18399228098.pdf In PDF document text
    • https://hsse.hssanesteban.cl/files/25141434840.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c31f05dd602---pimave.pdfIn PDF document text
    • http://shadesvalleymounties1969.com/clients/868959/File/mujojekemogaji.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/18115744357.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/14466271857.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2661677b5d---44640859272.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/33428488191.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/uja8e0mimkhclth5q90qhlt4fe/67287895320.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/ol2jseotjqcvfand0olqmq0q0i/lizarowumokagu.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a98af8ccc88---narosovizabaliru.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/6a4f5bb0d961b1f79a17ba2232929464/13177613393.pdfIn PDF document text
    • https://rcot.org/userfiles/file/72935769533.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/gobizelaluzo.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/38469398319.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/6260502423.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/kosagojiwedafijigusedelu.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/d62bf802ed4abf6ea528c1793d290b37/nimezebavusepexijurubep.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/31857191415.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///91271695634.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611dff60d55cf---37816751100.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/96217044698.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=classification%2Ftaxonomy+worksheet+answer+keyPDF 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_off0000c2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A4 18144 bytes
SHA-256: 0fa10114aa9ce7984a0381dbaaaaf42c6c020c0aff425c4bf36f3b894dbf16d7
font_01_sfnt_off0000f09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09E 11060 bytes
SHA-256: d99c769e1a3c69520b928abafae6aa6578504473e69310e7f55e57e8c0f3244b
font_02_sfnt_off00010a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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