Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e13e3ffe214d25e…

MALICIOUS

PDF

67.1 KB Created: 2021-06-24 23:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 01417667c2587cc277be0fe8a6498c25 SHA-1: 862c210101c23532d21caa5f94bd0167e1c6d3a4 SHA-256: 9e13e3ffe214d25e73810197b1893aa65f41eb1689406b8278aa9bcf6edb0e55
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to distribute malware or phish users. The document body, though heavily obfuscated, appears to be a lure related to changing PDF viewer settings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://qtjdb.com/UploadFile/2021/05/16/file/20210516_135135_138.pdf In PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/d3b68a3c59552f931f1aa4636e974947/76269157123.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/mijazutigufadorubox.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/9llifofq5ahgt571mlsns5vrvl/56568193494.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210606193252_jthbxy.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160748e2675f80---15989816468.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb9a92ea22---toximikojunamafazaxemusa.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/d651d9e94c4ff9db68feb9fbf5498219/23871659072.pdfIn PDF document text
    • http://ahchala.com/img/file/xekam.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/qkkh69e8uhvepie7ue5fj7jo6d/42173787899.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/dunexixijijop.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dc56b6d9e---nolomebidupajezubol.pdfIn PDF document text
    • https://bczenekar.hu/files/file/titegubozovarokab.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e85c0f3f1---16105313092.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/~3/3vuEKuznOb8/uplcv?utm_term=how+to+change+my+default+pdf+viewer+macPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC815 5604 bytes
SHA-256: 91f8985166d364c36e662374d527a10717eab5302ba403062a01087dd9ef1c06
font_01_sfnt_off0000db20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB20 10648 bytes
SHA-256: 8e6d6202a9daa20a189c0bdef742ea84e5213f7494e4eb5834f290e14b450c46

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