Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c103ec516edcc13…

MALICIOUS

PDF

73.0 KB Created: 2021-09-05 09:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f8bbb6625a61f5040226528f08cf3114 SHA-1: 80ecc0d3f50278a4fcc2ba0014a5630c6de361bc SHA-256: 2c103ec516edcc13f3be4fa8f76d5f00d72ab8f55f53f1c06b06132c9e8d19d0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to lure users to malicious content or phishing pages. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to manipulate search engine results or track user engagement with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a78e9a302---mexuziliromiwipawo.pdf In PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b19aedbc3---72363595502.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/50517395244.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9b56031b5---nowilezizoserajanixexove.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/u8megdk3u9q7utdgo85r8d8s41/futisakegatozadarere.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160910cfc413b3---ribizixikakevilafonoz.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021060802023271.pdfIn PDF document text
    • http://teplospectr.ru/images/files/9956798291.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7b7ea8761---8184873772.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/iuadro7o83r53veajg0ea0kuu7/suxosekoxamiw.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210805_181652.pdfIn PDF document text
    • https://ckmusicdesign.nluserfiles/file/torajopujigezofezafe.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c6f3f0a0b---29494637124.pdfIn PDF document text
    • http://jhroseclassof77.com/clients/45984/File/33630381584.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/delopegufifizulumajif.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/56954398870.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/3058374316.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/46244313956.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/23bf1beb70385d66c49ddd2dd932ada7/lusajowogebegotafoneguvo.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/29346731877.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/66604082322.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/didewurofobisadewanime.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081fe3ad48a6---68929212774.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/dojejubimedutuf.pdfIn PDF document text
    • http://cordovajewelry.com/images/file/zenixad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=sejarah+sastra+anak+pdfPDF 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_off0000c041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC041 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD858 10632 bytes
SHA-256: c175f5cb7522d3f2b43d618ba183b7b7fd85b26304a7619e8f0dbe5afa942b68
font_02_sfnt_off0000f09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09F 14936 bytes
SHA-256: ac18a0ce3fa4c966d104913d0a48b2f48b89d3e481197ab17ce312bad83b80ad