Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad8ddcdc1f8f37a…

MALICIOUS

PDF

63.7 KB Created: 2021-06-17 21:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 9e0610236610006a484ce10227e91d5a SHA-1: bdeab271e8103b94e2efc777bab2dc33fe4c41a3 SHA-256: 5ad8ddcdc1f8f37add2a5e5742abe70f788b0754f1094e88d4af8c5803f622be
154 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which appear to be compromised WordPress installations. The document body, though heavily obfuscated, suggests a lure related to downloading a "ppt to pdf converter app". The presence of ClamAV detection and ML classification as malicious, along with the link farm heuristic, strongly indicates a phishing or malware distribution attempt. No scripts were extracted, but the overall structure points to a malicious document designed to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8680

Heuristics 5

  • 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
  • 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://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5978313982---dotebipoduw.pdf In PDF document text
    • https://burlingame.com/wysiwygfiles/file/mowumurubameseworapafutex.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be8c0f0a7ac---serudekemanomoli.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16074fa8f1dfa5---bumixegofuxemuvavumog.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/e1db4643243d58bd3e462f42e7c0246c/98702704128.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cd7d5d1f4---45951680550.pdfIn PDF document text
    • http://bdn10.cz/files/file/lutibesoruxetivozisujog.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/wavifefuvoboxitalazuma.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/je8ard8mqgf7us09ofsnfb4an2/vuguwodemozobur.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/ct613il9921hlu9a34c5kikhbv/98873536458.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608db993b2b3c---5652553096.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16075ac211c25a---81397170245.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/tepemobidi.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/428dd480714bd11ee94fa6094090448a/kixiwofo.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/9f64ee7f22903639a73263cc953eb8ee/80978584143.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/1606941e90cfaef6d161a30711aef47e/fovatodik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ppt+to+pdf+converter+app+free+downloadPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE223 5124 bytes
SHA-256: 012479d66bdb99ac45844d7df01bfa620c1adb36133f099f612e48597d71dd97

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