Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c96b46e72107d49…

MALICIOUS

PDF

91.0 KB Created: 2021-07-04 16:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 80662129ae0bcab15458a64146c88e7c SHA-1: f96e174ff1c6c930d3decdd374e23670e994e98f SHA-256: 7c96b46e72107d4957ac7e7bd4c943af178cab46fe9aa896779f4cb4db2df3fa
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 high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to redirect users to phishing or malware distribution sites. The presence of PDF-specific heuristics further supports its role as a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://cructi.ru/uplcv?utm_term=coal+producing+countries+in+the+world PDF link annotation
    • https://baohohoanglong.com/userfiles/file/zukodoz.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/nt4gce6c8la67koq0lk3i3mo0e/texufajariwemi.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/6ee97e5d1407cfb24e063caeb8147209/nunuwosowakaved.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/4c3f7cc04d1570fc5c6cf2741cfaf391/85962284804.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/22570226508.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e5e8ebb16---99626819577.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097a368ee16d---metakotibonazawebipap.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/jisexerabafatupel.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/rezibedijotomen.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/57062e9e2a10e24dc9eb4ccc2ebcbbac/28554560686.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/9249f0f15ec1f4fb22bbaef80d69d304/xapile.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/sogesivetigudaru.pdfIn PDF document text
    • http://carolstoecker.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/46498427889.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/c8avjrq7idgc3jl1aagvodtg64/lugegizavedokabimapiniki.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/e44c00b2b7e038099dbbda5cbfe94490/95902293521.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e254b5947b---rafifuviraxeminibobu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/61074771796.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/68030094328.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/3thr7mt11qkr3msg6ekout0amg/vuguzese.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/kemidisupemifup.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-7-3/20210703035241209208.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/3f97896463a91a3d1ffe29d3fa04b1e5/6007319210.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850b061d418---97646993748.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/91947989009.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_off0001003e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003E 11008 bytes
SHA-256: ff11486e1c445d7f6463996a3cf2c4df3e61af5febbdf5c280a8342dad99525f
font_01_sfnt_off000119a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A6 17440 bytes
SHA-256: 5121adb0cdcfc719d16ea78aa40ea3acd3f556827bb87dfcf1a541845171be51
font_02_sfnt_off000146a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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