Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a605874dd6bd730…

MALICIOUS

PDF

92.1 KB Created: 2021-09-12 23:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9ec87ef7c52f57ac2ab77832581b4773 SHA-1: 4aaf188385492dc47ab956b4c180c8c5d407993d SHA-256: 1a605874dd6bd730c15712ddefa8be8a1b6698b85f7a983c3189244cc2fb7eb7
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress upload storage, with numerous links pointing to potentially malicious domains. The presence of external URIs and the nature of the hosting suggest an attempt to distribute or redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/3f9d7c9ddc259e90271d8043b315fac6/mujikusaligogipame.pdf In PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/wovokidotuboditow.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/19487648547.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/27611317470.pdfIn PDF document text
    • https://andana.us/files/files/jizafamalapivames.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/70596839548.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/sabazaju.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/zavijovalodarogene.pdfIn PDF document text
    • https://prevodi-plovdiv.com/userfiles/file/vunuxu.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/26297518033.pdfIn PDF document text
    • http://egitara.com/upfiles/files/29244236634.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/822d285f5e3c041a89e312f6eba1b0ce/talixe.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/posofaninet.pdfIn PDF document text
    • http://didula.com/img/file/vuwejuxesokabagogigure.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/nawemefi.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/lopiradalirunogudak.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/48480958174.pdfIn PDF document text
    • https://tebra.si/userfiles/file/94933575316.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/34184080104.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0688593001630542058.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f50cb3b77d---sezez.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311dd759bb4---wabuvubixejodi.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/nisavefedutatalim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=the+walking+dead+online+stream+freePDF 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_off000100ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11916 10940 bytes
SHA-256: 57a193053f0dc166662ff102298f7e339c17bfc1aadf1ccaa6079802d5afa525
font_02_sfnt_off0001321c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321C 18740 bytes
SHA-256: 1a654e6dc4d2650f86abe35c6b6542079304b7cccc268f0d45c9db342a36c03e

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