Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b73d48d273be32…

MALICIOUS

PDF

122.2 KB Created: 2021-09-03 11:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e2d6c7a7bf383ce003af81848badcb89 SHA-1: 584db161d0168a30fbe08a9bf9e87831182671c1 SHA-256: 33b73d48d273be3210f6b7508a8c574c3d98b0077296042814e2b08f4909a5ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and links to compromised websites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pistant.ru/uplcv?utm_term=machine+learning+an+algorithmic+perspective+solutions+pdf PDF link annotation
    • http://pusheng168.com/uploadfiles/20210808033718.pdfIn PDF document text
    • https://kaisar168.com/contents//files/92116902056.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/lizaxibewedaguxujavazutu.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/59b584255bf8919fb47d8d563586ffb7/36432969713.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/tedatosadunisitij.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/93710451944.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/906797ed23dc17f94a3696a14705e23a/83112194870.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609edf540a754---41573459359.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/375ab8cdd05b497d93e85e3846b5e50d/zitosix.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/jovig.pdfIn PDF document text
    • https://tanasiri.com/piceditor/file/47846290269.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/9ec6a43591b3f20b8f514cfeb9f69e45/4931857660.pdfIn PDF document text
    • https://ibericadearmerias.com/file/38046709123.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc659b37c7---68245743502.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/junemebubuwar.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7e6221ceb---45824347327.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/81a31955ad12d93a1902f8a491cf8bd6/65852486554.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/c9feuusbo0o17uejjeoedunb7r/jumifewavidanifekorebilej.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/28521371041.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/16298927946.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/1620369484697.pdfIn PDF document text
    • http://nenorm.com/files/files/fidevexo.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0077dc9310---58062751175.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_off000175b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175B9 11224 bytes
SHA-256: e45227c08ad9ded458a281d0e914ee08420c96849b196ed3fd6d1a3f9660b204
font_01_sfnt_off00018fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FA9 19516 bytes
SHA-256: 0a4e4586a5e89de21db61fb5164a906c1ad8451f0dd90ba1bfed913f7ac2b004
font_02_sfnt_off0001c26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C26B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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