Malicious PDF — malware analysis report

Static analysis result for SHA-256 c45d9c32d27efad6…

MALICIOUS

PDF

75.1 KB Created: 2021-09-24 12:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2366a8e71189df696891dbc33dc84c24 SHA-1: e98e55fa2a71eb93accf727345677a86caa4277f SHA-256: c45d9c32d27efad6d9df4c428d7b043f11818c0b6604bcabc689c74dc3e40e99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to unknown PDF files hosted on various domains, some of which appear to be compromised WordPress sites. The presence of embedded URLs and the overall structure suggest an attempt to lure users to malicious content, likely for phishing or further malware delivery.

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 http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614201950edbf---38444593736.pdf In PDF document text
    • http://animationcoach.com/userfiles/file/37263978808.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021091615464173499.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/33158408744.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/47271700639.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/31171148982.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/96600475606.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/91313087156.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/repokajitupetiw.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/kunofusem.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210917160959_lj8zbr.pdfIn PDF document text
    • http://cobmedia.hu/include/95864754543.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/85169759876.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/65626002109.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/87232831622.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/zajuvarikifudikabar.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/akvss0jgn0od7e0oq6k7kcuh15/nuluriniseruda.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/kemidisuvotoneberujujej.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ovr08j4i1k4pg8ndjtueuhtbv4/21899779644.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/25261908770.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/fivoxufozaja.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/molaluginivebipigib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=find+updates+for+my+phonePDF 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_off0000c217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC217 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2E 10908 bytes
SHA-256: fb5acda530b9f029499a6bd91d9f7a5a79c6a17a5654902235626d3ea43b6195
font_02_sfnt_off0000f345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF345 17040 bytes
SHA-256: 1f5e858a86be2fdae04d34a492749d8b74c84ff2b34787e4de6b70f79f65426f