Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b7ca4fe7b85a4a…

MALICIOUS

PDF

83.7 KB Created: 2021-07-08 02:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0b4c06bc1b17154a07e6390c0fe20c79 SHA-1: d2f6fffa57114379d9a857c68672526af7d26643 SHA-256: 21b7ca4fe7b85a4a43ca29824a58a7cffc95a5f1fdf6f744610d5e8249b3c9ff
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting. The presence of numerous URLs, many hosted on WordPress installations via the Formcraft plugin, suggests an attempt to distribute phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=home+equity+loan+meaning PDF link annotation
    • https://vestol.bg/files/file/xorifepaduforabupolewugiw.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce5f7dc4a3---68596859370.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ed4ee40be---rezubezedivifizonu.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea6a5a7a13---rijetepifawatadatorili.pdfIn PDF document text
    • http://sonkertrail.org/clients/9/92/9260a3c387aed4615f72c72c3a1da295/File/41247087452.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/fuzaxidaxux.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00464c15c1---67313061065.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/b5c51c142ee9d785591c49438b102dba/takabalometevetubasobibe.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/pafuwoxalejozex.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/04aff264d813e0af0541b586de63e3f2/toxavefizunotolevalolafo.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd32ae4330---nipulisowizonirikilokawu.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/gajonorisebot.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/64q15ncnebqva6jb7nm3upgi1n/vikox.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/bobemujugofabuw.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715825546a2---zusibu.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af6112b7f44---babimumagijerugizalirexag.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/vkghlaol7dvvglb33adiopsoql/81381510515.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608124fcb9712---tixewip.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/c9139f48803ff4fc3f5bad0ffdb83e1a/deguk.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/jupovuwude.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_off0000e3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFB 10532 bytes
SHA-256: 369c8c9df2429afec849144a118bffa96653dabe0025f3727564ad9ae5f2a3a1
font_02_sfnt_off00011396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11396 16988 bytes
SHA-256: a11a8985f1b25446c1aac773ab8d065d5ad85c728e8526ecabaadbd679339488

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