Malicious PDF — malware analysis report

Static analysis result for SHA-256 f77d76b15f2f957b…

MALICIOUS

PDF

86.6 KB Created: 2021-08-02 22:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5c60996037be75d371c95ab7752d01fc SHA-1: 24a697ce3343d7ab10a5fb654502a70bd882f72f SHA-256: f77d76b15f2f957b595ba608c1dd556a50a3ad5259eb22bf999b72679f5e6242
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs, many pointing to compromised WordPress sites, and is structured as a link farm. The primary attack pattern involves directing users to external malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=how+to+hide+apps+in+android+without+any+app PDF link annotation
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/2ef2a49c2b3a2dbe4cc9e05ad59c9240/92425563328.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/zekizekoruwufupuwate.pdfIn PDF document text
    • https://aneri12.eu/res/file/wosoxopoxe.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca984073e5---87631818775.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/mi001q1cn84crl23v5h056aipe/zunisifuvav.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/66f5367793a46bfcb9676ac554cd7571/fadinobob.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/jubigikagomabibezagij.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/11984835029.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/54893164431.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/xepoxokutoriroxudugozu.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4a80594c2---wulafewimubotelisoxofuzi.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/t6okdq9f1prvvffp53s2jjlmku/75344538932.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2de28c8a3a---mozowesivajawetatari.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11906643019.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e093e7129cb---35793056155.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b2bcb450b---wokitep.pdfIn PDF document text
    • http://gtshotel.it/images/file/jekujetazopetaribu.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/s48ovdv9vi481gqtbg6akoj1ds/kamonipixotofatoxiparexi.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/41419075339.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/ce47da5f7a28e723ddff091661022cca/62403913995.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/fovodubewobonaxexike.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160da5d56e3a65---nolajobawizus.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd97936822b---86114483909.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb7a67eeb9---wilunegibofababebozoxo.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_off0000f081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF081 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10898 10732 bytes
SHA-256: ea1176f4768db64ec657f06c065c7a4b2afad1f61402383a303ad3d1e62c66b2
font_02_sfnt_off00012142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12142 16772 bytes
SHA-256: c133744708270b9dbb99f56e2daee39dcd751884dbc4b9a57f3bc38f2ce78b70

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