Malicious PDF — malware analysis report

Static analysis result for SHA-256 248fa3fc459dadc2…

MALICIOUS

PDF

124.7 KB Created: 2021-06-30 04:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 13bc73638f6dff22cda9c86b8a872131 SHA-1: 8baa94e7bf65a9d784cf7ad116d12297b50acff9 SHA-256: 248fa3fc459dadc266963d2b2ac14dcc4cf3cc763a518f51db7cd877721fd3aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains numerous links pointing to compromised websites, likely serving as a link farm to distribute malicious content or phish for credentials. The presence of external URIs and link farms on compromised CMS uploads suggests a tactic to leverage existing infrastructure for malicious distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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=national+language+of+costa+rica PDF link annotation
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607109b9388e5---pigefukikawibovimekijeda.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/43265160024.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/ec616608ce36ae0870493ce9dbccaf57/16462011927.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/jozozigazuxotoz.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/ddcf0d444e3f32d7ca5569e185a2d1c3/78084103542.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/61427041130.pdfIn PDF document text
    • http://stevis.cz/files/file/lagez.pdfIn PDF document text
    • http://valeneighbors.com/userimages/fadoxomobeda.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/xefanogipam.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/78179972848.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/92619524630.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/13101e337cd4c46c86f4f058c24fe013/58446986598.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607527cdb4fe1---18862785918.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1a8e878fa---18909998053.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/26932379171.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e6f880ea3---9560405906.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16086dfa73ff7e---babasexulepi.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88637ad366---5012007228.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/xonekedidu.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/lnquih3bdrgtkuaai2h0sqdcn4/36045201309.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/23601440422.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_off000182ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182BA 10588 bytes
SHA-256: 437794193626723e502230cfc61cb4f692f07bd9ede2922498a5c1d21a3ecbbe
font_01_sfnt_off00019b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B10 20476 bytes
SHA-256: fc133c5b7f80409e0effe5e92d45c0420e4227bad820cdb89974fd4192e6defb
font_02_sfnt_off0001cd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.