Malicious PDF — malware analysis report

Static analysis result for SHA-256 598082b14545195a…

MALICIOUS

PDF

114.3 KB Created: 2021-06-14 23:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: a245e7206eed3387de744d75354ae356 SHA-1: 66cc0793552101cdcbc7c915470a60991741a31f SHA-256: 598082b14545195a6c5a8e8180f78cb9487d45f5ccd4aec73aa94f8e4e4e87a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 https://catamma.ru/uplcv?utm_term=real+world+example+of+a+parabola PDF link annotation
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d5acdf9d1---53850513370.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/5f8e8b28111e4918ca4ce92af250e671/54189722554.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/s9f4th17p3jtt5crbv8ehgqhnj/42818233372.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/41139217b91e77123c22812ced55f090/12002056686.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/eb1ecfbbn449pgt62emf4fgk3c/89083502013.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/l4bu4ag4njnav9h0a7ehicam6c/70689001434.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/wofozozuxu.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/f23c35ef483b896a3a6833f337a05279/kakokejakadowi.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/02df0bb2b2f551e2e0043f4804ddb808/lizubafaguzumomupupagu.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b30a65211bc---7557974336.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c027876d3c1---vatewafigo.pdfIn PDF document text
    • http://0930actress.com/files/files/luxuj.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/0vsvmoe5pcd98tchfu1omlr8a4/50516682504.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/65238666879.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001759d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1759D 4868 bytes
SHA-256: 72464673ee3a0e99d609b9cacd8851f77b501a9c0adc46b0363d2d394590e800
font_01_sfnt_off00018642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18642 11548 bytes
SHA-256: 2a2b2b280a70969f3af8de0cd2dbc51cd5ea8102493cde045129e11cdcfcde35
font_02_sfnt_off0001ad8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD8E 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361