Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3265466fc6ee739…

MALICIOUS

PDF

103.2 KB Created: 2021-09-20 04:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a1247072555a2a7e6e3e7cbe114b6812 SHA-1: 8a630811bd8c954df94c2be89d2cc5714aa5aad2 SHA-256: a3265466fc6ee7393ccbf10ffe5d4bc24e402ed4652beb3b524498fea39d504e
156 Risk Score

Malware Insights

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

The 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 hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the PDF is part of a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://crysiq.ru/uplcv?utm_term=android+answer+call+programmatically PDF link annotation
    • https://bimore.vn/webroot/img/files/nafotuw.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/subiwekuxorovamaz.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/73246645405.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/birodufazisepugovex.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/tuzasiso.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/75150580758.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/82253762826.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613dad9e9b18f---lorolimogone.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/28872269252.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/lukemutureruvokag.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/pemonamenikedi.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/31044302078.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/vudos.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/tibinididiwokopad.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/tixubukejibazuwamife.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/58238523646.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/82312210953.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/subikotosinimidejovo.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/75537244828.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/292nmh73k2rg8t3scqrq3ijqll/pulugafujima.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2e82399fcd85480dc84d0f4963ed2c60/30261555796.pdfIn PDF document text
    • http://mrybalko.ru/files/29779761023.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/f47b2c5a4453c5a8061efd5272c8d9c0/17417082507.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/nazukuserununerepevagaf.pdfIn 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://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_off00012b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0B 19224 bytes
SHA-256: 76694b500bf39dcfb1d024dd2e83243b684e818a920cbbb665dd201789050981
font_01_sfnt_off00015dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DC3 11036 bytes
SHA-256: 1f75b2e41effdacb192407bcbdcdeec2e6a5b80c9a9e8d663dcf380ee87f296f
font_02_sfnt_off00017751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17751 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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