Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1eb1b178b4b46ae…

MALICIOUS

PDF

81.6 KB Created: 2021-09-01 16:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e2458177bca72765da0b64698df143cd SHA-1: 594f6983e80cd059879c484d684132f38f1b3f6a SHA-256: f1eb1b178b4b46ae1b2225f45d1b713fde7abc1d53df26ab6f2edb84090207fe
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites acting as a link farm. ClamAV and ML classifiers have identified this PDF as malicious, specifically as a phishing trojan. The primary attack pattern involves luring users to click on these links, which likely leads to further malicious content or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c400f45fa7---sulasilubafuxe.pdf In PDF document text
    • http://rld-carbon.ru/file/32664002909.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/vowaz.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/27837604647.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607424d3d98de---kunufimakirofabotoborere.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16098dedb1ad97---vominunutuvaveg.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/1320198148.pdfIn PDF document text
    • http://kgmda.com/upload/files/jemuvijorifepugafutenepod.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/95835961640.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b462bb2c59c---danezite.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/2aa15b657f5567646bbb8afd4ae00297/68614700677.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/dowaralonurelanabepufe.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/86036953093.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16082bceecbb7c---bulafizadile.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f06c228bfc---vinajurewidomeremusanud.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/ziwolitirovo.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5419342fe---bexotuvo.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f37c275fc8---45463987222.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/bakijidelumofipeda.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/rarikebome.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/6flaa4430q4v6pf8lhr3pc2gp3/xitevelar.pdfIn PDF document text
    • https://actorconseil.com/files/file/50123302714.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/71867075908.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=white+cat+with+tabby+patchesPDF 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_off0000dccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E4 10436 bytes
SHA-256: e6351ec049c1fbd144d73779b4c41086cc3f899f733f2d281aa5227a5026f3e5
font_02_sfnt_off00010c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8B 17000 bytes
SHA-256: 53bc39fb18d807510434332c73af7ec112b3ac3912056a55707babbc7366bb65

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