Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa3841c7fd78bd1f…

MALICIOUS

PDF

99.8 KB Created: 2021-09-05 01:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: be20072ce6af91bc992968ec132eee28 SHA-1: f6f1e1fc9082143ed7c85496e37d963e4226b0cb SHA-256: aa3841c7fd78bd1fcca3e2fa46cc15e7de600004bfd8ec508a79f538efdbd7b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious or phishing content. While no scripts were explicitly extracted, the nature of the link farm and the PDF format itself often implies the use of embedded JavaScript for redirection or obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/g2b6frsr53iekqfitb2a72nl01/fajusobati.pdf In PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/94717150143.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa56d011409---48897554449.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/96f44cfe332ec2fa5902dfe48fefb8a7/22367475604.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/94066206101.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/15778697225.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/dilojefi.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/14ae36c8a8faa389b6890dbdcd3cad3e/2540623302.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/84196962422.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/31401079184.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/jorajulikov.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/73db9b69d64e47202e697f32a05fd5b9/73987817107.pdfIn PDF document text
    • http://gurukripapublicschool.com/userfiles/file/46828580557.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/musewurovivoxu.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/76829840508.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/2849163393.pdfIn PDF document text
    • http://master-br.ru/img/file/19166409538.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/givolegatorotofe.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/nixovopitotam.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/rovpnpvrni5g6du5gpknd1ngg8/4149713383.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/epeaijmkm5rhbni86cjs0ehkas/fewijorukirudoxedasinato.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/235398621.pdfIn PDF document text
    • https://ecoretras.com/file/zedisetadomesorubitujibe.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/bajivazeve.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24e8c56162---jutaxu.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/bc97e9a05dbc743f40a75c61cc0e9e00/22908586673.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=medicamentos+inductores+del+sue%C3%B1o+pdfPDF 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_off00011a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A94 11080 bytes
SHA-256: 38416e2965dc9cdcc6ab1af640bd94efc0259e78d801d91a0d3dd0d9cb2829d6
font_01_sfnt_off0001341d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341D 20084 bytes
SHA-256: 96a8df8f13adb27ba2b1b5595c95182f109b607ff2562c3219386bd60c5b7c09
font_02_sfnt_off000166d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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