Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c0be403f6964b4f…

MALICIOUS

PDF

79.8 KB Created: 2021-09-06 19:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 87d973f9fa637320f961c0960d667fe1 SHA-1: f0f30c8e60601deea9e859375a02af40e32380b9 SHA-256: 9c0be403f6964b4ff41ade6f4139b55ea1b3114bb791d9126c5774dfdafe4f19
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous distinct hosts, many of which are compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct textual clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/75d693920ee22ba1ef8503b29cdb34d2/befomewidifivelo.pdf In PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/a85c07e685f73a2d016ed30b930e6687/38654561587.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/57748082353.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/95887376857.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/0dab975b8de3818069fafb44fb00f459/67192130428.pdfIn PDF document text
    • https://fundoohairstyles.com/hairstyler/images/file/62210216242.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd73f920e5---salasabivotumasuru.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/nedalizuneragemupif.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/1d6d8ff8aa2a6020e5920b0056475294/pesasisileralorotawodave.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aab0f42043b---85596531961.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/kigusagi.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/17ipg8m4tu1it42qd79l7a8nut/90473260367.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/85580171611.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/1saj57djbrlnptibs4qbau7n84/nidadi.pdfIn PDF document text
    • https://glory-aqua.com/userfiles/file/pitewemopojitifol.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/11364800301.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/57709685113.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086209630ba8---rawarozuwininagerukiro.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/14676323089.pdfIn PDF document text
    • http://pmke.cz/pictures/files/26514345792.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/22596144052.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec9928feb2---13831234322.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/43091344661.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/ketukumudokafab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=sixth+grade+math+ratio+worksheetsPDF 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_off0000d3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CE 10900 bytes
SHA-256: 8d5a0310bdf8cfbeea0f96fd49d9e7e3631354c3eae4f20b335ee668857ccec8
font_01_sfnt_off0000ece9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE9 17604 bytes
SHA-256: c3e30a2921c639a61714d204d1007f38ad4cdc8886e88e5318bfe7fb49d90655
font_02_sfnt_off000119df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1