Malicious PDF — malware analysis report

Static analysis result for SHA-256 b83c7505d02ca0d6…

MALICIOUS

PDF

88.2 KB Created: 2021-08-20 19:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4edbc471b49d36f2b4b60c7c0e1b5e95 SHA-1: 0c3c1b89896e8537dab8b10ea1a6473992fba995 SHA-256: b83c7505d02ca0d65f24225c87d9c0358ede6fb93e5b26b72cbaca8da7650aab
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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=how+to+connect+bluedio+turbine+headphones PDF link annotation
    • https://kisikana.hr/userfiles/file/68541469421.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/d6h162vuqhhcr628kqnc7q9vih/gemuzezudopabapi.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/83178101807.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/metav.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/92585852624.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/2677bc4c5c686a23a532721e8a22a85a/67417116495.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/senajesefobuwadugu.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fd619c1b9---muguvawapofarebez.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/e86d0ce4e06abced57a6f4c7392aea6d/40824321444.pdfIn PDF document text
    • https://073741256.com/uploads/files/202108170025375615.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/81676925623.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/jirojosiripekubidu.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/icb5ubl3p5221duma0uviml6k2/20690499403.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/59924632878.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/70229410366.pdfIn PDF document text
    • http://flexicourse.cz/res/file/jejewasoxebetunigulo.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/25900062129.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93bf317e6c---78055520802.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/nadif.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8e8a4b47d---vunuluzerefibagovonisebo.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/rea884cd462jf9fofa9f6b16ed/17573686271.pdfIn PDF document text
    • http://immopolignano.lu/images/49192440302.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/41d6f8285bb19dbb6365f1cca734058f/zisamonufekadi.pdfIn PDF document text
    • http://stromzeleny.cz/file/gajinununixatefomizorube.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99C 10928 bytes
SHA-256: c103ff6fb80be37ef3038aa63c9d9342812d4b1628bf89acbc6d2d76ca3c3b02
font_01_sfnt_off000102a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB6 17608 bytes
SHA-256: 5a35b27c02af37b2281a74af5846533a140f3bdf870883073c8cbb54e7b259d9
font_03_sfnt_off00014931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14931 1732 bytes
SHA-256: 5b3c947262022625ef2d4cfb2d0fa10a94f23c97611fd4c7364bfcc62a76ce6a

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