Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaed622f44b73fe0…

MALICIOUS

PDF

81.0 KB Created: 2021-09-10 15:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 89c2489981515bb3c38a0506a2254e8c SHA-1: cea6b6368d0826bf2c054645f54e2c993fa44748 SHA-256: aaed622f44b73fe0fdcb9851573009d231740d4c2fc072ff662022444d307d01
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous external URIs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated and does not provide direct clues, but the overall structure and URL analysis suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac83fbb436---8598012446.pdf In PDF document text
    • http://bjsddesign.com/filespath/files/20210906002313.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/82189236599.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/78662453919.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161397097933c8---9839579356.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/39432939727.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/fimogofibilegodeg.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/25400789265.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/tofenegudojuxisox.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/37455735529.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/ritejimuzepepukojovipij.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/wewedoseludowinux.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/budirinifotapupika.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/45029404828.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613415797e542---22495465267.pdfIn PDF document text
    • http://khmim.com/ckfinder/userfiles/files/wejunalavamevu.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/76027805732.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/63826663439.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/mifek.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/92180340181.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/sexudawofosadopaxuwibum.pdfIn PDF document text
    • http://canadanur.com/resimler/files/56933104078.pdfIn PDF document text
    • http://sun-eko.eu/files/file/namavo.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/52976140851.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/7426710651.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=avatar+movie+in+tamil+watch+onlinePDF 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_off0000d6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0B 18436 bytes
SHA-256: 7c05c484b503260f652deb3f8d23f847888d7b9427e29e79b47c257112845409
font_02_sfnt_off00011e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E78 10460 bytes
SHA-256: 40e4b735aacb4f3980756329be2a744d5e5e30233733d4543b093a825b44e3ad