Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a2d8f8eee392c7…

MALICIOUS

PDF

84.8 KB Created: 2021-09-11 20:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5e9c0bfb07fd79373b2a79a5bca5c7c1 SHA-1: 231932091fb681d285e3c897578362857072985c SHA-256: e5a2d8f8eee392c7095ccf73618a46d0c90599734bf610bb1c78cd0e320848cd
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of multiple external URIs and the overall structure indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://parvazyab.com/basefile/api203/files/sikoripezozowek.pdf In PDF document text
    • http://myshopgroup.com/userfiles/files/8384727828.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/35426946885.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/buzorejavezexoke.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/xotikaxapumifemarariwov.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/nuwefijaxuvixixofi.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/gekubidajefelib.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/julebesasanuboge.pdfIn PDF document text
    • http://sentai.cc/data/file/20210905_050805_113.pdfIn PDF document text
    • http://01host.ru/userfiles/files/kiwogexeli.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/geparasaveworunirekokab.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/0lo33e153jr87o50crr1agmkbp/juvamofijakademojitubupuz.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021091010490473499.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b341c2cd6e---15900725712.pdfIn PDF document text
    • http://congluc.com/upload/files/89037099892.pdfIn PDF document text
    • http://vetusmeter.com/images/upload/File/9455839288.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/kudajudejegodivolizuxid.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/cf9d0e427733aa8a27d5ae075d6301de/vavirezo.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/15426417141.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/wedulojaseg.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/ufs5gn8eva8r7upsf9afbf1697/19584614219.pdfIn PDF document text
    • http://www.polni.si/Images/files/95919044176.pdfIn PDF document text
    • http://telektrans.hu/editor_up/zutogozezebonelabum.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/zubomefalevu.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/24775582999.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=cheat+game+shadow+fight+2PDF 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_off0000e55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55D 18172 bytes
SHA-256: caa26ee57cecca0c6c310e8232e1c7574ba456dd6916e59a4b35d3a82ce73169
font_01_sfnt_off000114aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AA 10788 bytes
SHA-256: 853637714945826345bdfd4cabd998d1d5b168be845d9093acc4c89077903cc9
font_02_sfnt_off00012d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1