Malicious PDF — malware analysis report

Static analysis result for SHA-256 67cf68082c676dca…

MALICIOUS

PDF

80.8 KB Created: 2021-09-01 06:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 77916859478e019ee1a0049d816a5cde SHA-1: 252fa499c20f1a09ab2953bf2c4fa3668eb23c8f SHA-256: 67cf68082c676dcad9e24ce5c58ea1de226d06e71d980be089e302a05631f85e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF functions as a link farm, directing users to compromised WordPress upload directories and disposable hosting sites. The embedded URLs, such as http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/5ebd84b59c4b46656fdbee1c45525340/fajajukogezi.pdf, are likely used to distribute further malicious content or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077849b00b63---26170259619.pdf In PDF document text
    • http://kjphotocon.org/data/userfiles/files/rukovoz.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/9805d4165b75a5bb8c32f26523b8e2b7/91118917973.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720466efe8c---19494301519.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/rizojewoxefeteke.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/5ebd84b59c4b46656fdbee1c45525340/fajajukogezi.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/05d9rabgt2nfcf28q91qdgn7hj/lezujuzope.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/gepadumazusawajorujugabe.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/zeluderarutakimujesaju.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/6367697235.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/50ce44f12c715fa570509f1f0f9aa5e7/7215385229.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210628075038_l9jv6u.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/fojuguvefodipir.pdfIn PDF document text
    • https://allianztc.ro/files/file/14988175066.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/46v8mta523qidl3onn7mum11g4/68866513246.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/50752925147.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e1a62cb810b---49271367804.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b2be04497ae---76865266896.pdfIn PDF document text
    • http://qytbearing.com/upfile/file/sijilo.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/66287129243.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/19rvvt3kkkahlst6bbb8dci8sm/resodo.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/9988325882.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/47218045807.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/4cfb40e4134c44b036dfc3bba37fe6bf/77299313905.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0daef2c97b---20804754096.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=less+than+dishonorable+dischargePDF 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_off0000d6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF05 10744 bytes
SHA-256: c413dff35a087eb95c6551f12e97d94e8c58e30b9865ccfb52687e34b0ebf655
font_02_sfnt_off0001076b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076B 17936 bytes
SHA-256: 9422e6869e6025a1d1d1f998833ce63215297aff6a21a64fa077e0291e79bbcc