Malicious PDF — malware analysis report

Static analysis result for SHA-256 398bc63b33588603…

MALICIOUS

PDF

90.4 KB Created: 2021-07-21 01:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 339cf69e6c793795672189f241a253e8 SHA-1: 8aaa1039e091ab7ab135a0ddb9de5f8cfb4453e9 SHA-256: 398bc63b3358860309bf51ce706d6e138ad4b521b443bb8beda6ec302a487bb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's designed to lead users to malicious content or downloads. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports its role as a link farm, likely for distributing malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://e-cluny.cz/UserFiles/file/najulunedatesamofulusizo.pdf In PDF document text
    • http://jullien38.com/ressource/site-image/files/tigakubedojowometagaf.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a8ecb784bcd---vusanavumelujomav.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d90b7b45f9---jemal.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088bf9698150---30698778090.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607cf6b63b9d9---70048556516.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7480546050---48196786183.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/sukapovikuxeme.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087401d24de2---pebiwenojimov.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/56492753092.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/13693834350.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/21322907685.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1608e62371729c---basejen.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/4d07d336c4188622a0f31949a674c650/48087265822.pdfIn PDF document text
    • http://cartopack.com/Images/file/1382061656.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/mixotowix.pdfIn PDF document text
    • http://humanlitech.com/files/files/direbe.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/zepibalagobenixexaz.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/pemunoxuwoxanibebaluf.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c74d1f929---tededoxowusigarir.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/moboruf.pdfIn PDF document text
    • http://cpils.com/userfiles/file/jofawisuwemududilem.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bc10adf45---pulamukowedebilib.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160875aecaf1ec---63788996071.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/jaxozud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=ct+angio+coronary+with+iv+contrastPDF 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_off0000ff56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF56 17104 bytes
SHA-256: 2190a1527faaf99214fbaa3db6eeb841b2e0dc256e5d7feff8609bb8baf4cdfb
font_01_sfnt_off00012bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000143e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143E3 10628 bytes
SHA-256: d899a91f0e4dbb559dcd79b02cda917f6b418f46a0c3c4c30f74f27068cbf76f

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