Malicious PDF — malware analysis report

Static analysis result for SHA-256 a98d2f237957c019…

MALICIOUS

PDF

87.9 KB Created: 2021-08-12 10:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1139f92715b84bfebc35b56368d8e089 SHA-1: c4a04d2e76993c7fd8f0c766b26d7134e2f50d63 SHA-256: a98d2f237957c01943aa457404b4547101ceb7ba9e83eb3267bfdae0b0dca6e3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, and it exhibits characteristics of a fake CAPTCHA lure. The document contains numerous links, many pointing to compromised WordPress upload directories, suggesting an attempt to host or distribute malicious content. While no scripts were directly extracted, the presence of external URIs and the fake CAPTCHA heuristic indicate a likely attack pattern involving user deception to initiate a download or execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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 http://psychanalyste-gard.fr/ckfinder/userfiles/files/gefase.pdf In PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb2460ccce---38045237226.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/buxekutiwanazonapizanub.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/vuzulo.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/70624e4d881b06b210adc1153cb9aa7a/69585477895.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c085cac3cb---bufasotidaboriverog.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/78216524828.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c8c2912da---38525481115.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/93991192420.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/mefosesutabiru.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/lsbb9cchkelndplv1bs7jkqjk3/92846830753.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/82440158509.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/kobivuvivo.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/imobou3rc8l1knih5v2l7gvvqe/50201187735.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/81605622795.pdfIn PDF document text
    • http://ozari-ua.com/files/file/vewufezolisaxidagidem.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/molipemonudegitinorewujur.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/39463228752.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da41aad8ef---19757441439.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/14597961859.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/didokupipe.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/saxabijadagorebunuwexalus.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/muxegeni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=okey+plus+hilesi+indirPDF 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_off0000eda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA8 10440 bytes
SHA-256: 757886fbde4b9e81feb94226e04f2e611e196bf365c57a8b10b9afd4c84c8eef
font_01_sfnt_off00010545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10545 20148 bytes
SHA-256: dd3e6f056b7969816f5c5e6b9c229d6ee083c142c5bf906eded6c68b0d6769a3
font_02_sfnt_off0001374f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1374F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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