Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7654a5934e44641…

MALICIOUS

PDF

80.8 KB Created: 2021-09-23 10:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f90c787ae73b4daee1b37d1cb9db31c3 SHA-1: d6fc063c1a8f7a02584b485257c0fa25af7408ec SHA-256: b7654a5934e44641db4efa1c1848e71b2b7dc915d8891bfb6e1c62d67f946419
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on potentially compromised or disposable domains. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://alutat.com/data/file/92687789563.pdf In PDF document text
    • http://rutka.pl/media/upload/files/97d470ecc0c6e5b66fdde76dd6a1214a.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/82048478114.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/favam.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/72114333726.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/vejolitom.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/rujoviz.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/dalonovome.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/37821674776.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/gubunigexizimajufi.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139009f3e7aa---sowotulomezan.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/56980524158.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/21560267791.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/bizudabisafeje.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9784d61b6---13638821867.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/72861405685.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/0eb4711b1d08d0201c59f53e97097de1/7583247141.pdfIn PDF document text
    • https://nsaimmigration.com/userfiles/file/kejomabaxesidupaz.pdfIn PDF document text
    • https://majubesar.info/contents/files/purexisipazugine.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/45509226448.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/34884954215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=borrar+busqueda+google+androidPDF 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_off0000d714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD714 10764 bytes
SHA-256: 54402acc3787d685d4b50795411e44feba7a20869a098edcd7757f9ec0d7b0e2
font_01_sfnt_off0000ef68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF68 18136 bytes
SHA-256: 29c1eeb554df9de3cce0edab6526d5647d54097a1e97db4e7876166121c9681e
font_02_sfnt_off00011dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1