Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f2d3bfcd624de2…

MALICIOUS

PDF

83.3 KB Created: 2021-09-20 02:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9a9dc7de8609202e63c18ed5d12b3e8c SHA-1: 142c3985ebad2a732f8f69ede7e8cbf6ca9fb610 SHA-256: a1f2d3bfcd624de216dd2e221210c1a54186f4a14382e9de20150d7a84bce11a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. The presence of multiple links, including one pointing to a compromised WordPress upload directory, indicates an attempt to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://print-printonline.com/ckfinder/userfiles/files/zujumuzimegujo.pdf In PDF document text
    • http://www.moyekolodin.com/files/8826271540.pdfIn PDF document text
    • http://cartopack.be/Images/file/pikefibuke.pdfIn PDF document text
    • https://mollis.rs/files/xodivafiwuledopakuvalaxe.pdfIn PDF document text
    • http://arsvet.ru/img/upload/bujezuvif.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/bigiva.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/xazozomigagaxamimevip.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/ec7688baea719f0807bdb46265835031/76148161175.pdfIn PDF document text
    • http://fpole.ru/sadm_files/pemososizesufipo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613182a55ca5e---zanexajapazad.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/77375264636.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/pilokena.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/sigazederemuseda.pdfIn PDF document text
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/sekadoravozipi.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/14435804778.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/vb6dmr2po83hmj029hbiihjrfe/27402280636.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/xesufedizodijedakod.pdfIn PDF document text
    • http://vladekoservis.ru/files/keniviboxisudog.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/totij.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/65718782766.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/wusovegobulabakubukiv.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/11228452980.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/51394194184.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/59105680305.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=animal+simulator+games+unblockedPDF 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_off0000e1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EB 11024 bytes
SHA-256: e6e3e69084058dad93d188dd1804fb625ff3f9e09d578025b58f3424b2f7edad
font_01_sfnt_off0000fb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5E 16988 bytes
SHA-256: 2532c7cdd0b2f4f8b4618dad387431d02791951a494955eb11dd5fb6e785e823
font_02_sfnt_off0001276a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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