Malicious PDF — malware analysis report

Static analysis result for SHA-256 54289b45a6c52ae3…

MALICIOUS

PDF

76.7 KB Created: 2021-09-16 12:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9cc79f9197eec36ee66abb5155c741e2 SHA-1: 12c6da768763fe001249a730b2c3ea4f43832f70 SHA-256: 54289b45a6c52ae3b74d7fc935c5deb7a83184f4746452117eecdac63e36d8e8
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The 'wkhtmltopdf' authoring application indicates it was likely generated programmatically.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://philabc.ru/uplcv?utm_term=screenshot+in+mi+a3+android+11 PDF link annotation
    • http://jpind.pl/userfiles/file/dekulata.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/kidozomonow.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e76505ae27---96634217943.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/jivilixupuberovalelinubam.pdfIn PDF document text
    • http://hzqzg.com/d/files/28113249262.pdfIn PDF document text
    • http://mallncart.com/userfiles/files/60168238902.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/161404cc349310---mumisudumamuturafujizat.pdfIn PDF document text
    • http://qigong.ru/userfiles/file/13709961285.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419df839cef---rewuzonefo.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/wivizujawerakurev.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142dc8c9e53c---wiwened.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/fesojemuxerubewigupobo.pdfIn PDF document text
    • http://anindecor.pl/files/file/3202027766.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/10697686324.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/60895781386.pdfIn PDF document text
    • http://mylodge-naoshima.com/xepozokesomexeziganuj.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/sugab.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/4376933372.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_off0000c8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C2 16824 bytes
SHA-256: 19bb4399d227fc318c1426b78f5c441a15d85ccce9156161a552a31ce32aa042
font_01_sfnt_off0000f499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF499 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB0 10888 bytes
SHA-256: b29de849b59d164c3d86d6b5048189abf343489e0203f06971c8787d9034e478

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