Malicious PDF — malware analysis report

Static analysis result for SHA-256 9135e03a72b7e4c9…

MALICIOUS

PDF

79.8 KB Created: 2021-09-09 01:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6c3748c29a865e6496bdc35f9ff72c78 SHA-1: 2fc8da10def9642b0fb70ff0d43a509c22312ce0 SHA-256: 9135e03a72b7e4c94c4f9c3481d702f0c2e31d85a0c09b2450c02ebe035a818e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS uploads, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/9ceeba152236393d917c9fe32cf26ffd/voxedugekokugekin.pdf In PDF document text
    • https://qualitygums.com/userfiles/file/beliwixegepowev.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/45842210267.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/60642353169.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/jasomiz.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/30725308587.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/bomixopovudeseg.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/97091452317.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/64723182209.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/32749096246.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/juvemibubuvem.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/57048519806.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/62464658854.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/8bb5a67982d6b50f6063596857a40063/wonizinigewotorurulazo.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/momejebanumo.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/bikafur.pdfIn PDF document text
    • https://kenadong.com/contents/files/lunej.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/78565997929.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/mubokufudotak.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/3b0347c67f59bd8b8544d50aaa7768b2/zebofupofavamumanomidowu.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/63857815864.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/50616368761.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/nopekekijatufebuzomipusol.pdfIn PDF document text
    • http://citra.cl/userfiles/file/litumuv.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/momusob.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/26730747580.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=adb+download+windows+10PDF 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_off0000d7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D7 10292 bytes
SHA-256: c300165be82eb22e04659371c3322000f8fbcd00ad8e7daeb6ebcff285a49cc4
font_01_sfnt_off0000ef30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10742 16668 bytes
SHA-256: 40e364f195fe943ccd31374ca17579484034b58ac82f7207e2f1e7404a98e329