Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac95bff96348eb0…

MALICIOUS

PDF

70.5 KB Created: 2021-09-02 04:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 26c724a9976ddfffba1fb767cf400389 SHA-1: 78edee228618142b588d94a8dc95540ec1caa8cf SHA-256: aac95bff96348eb0af27577f3543242679230082bfec908a2f0cc4464c5b0d07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external PDF files hosted on various domains, suggesting it functions as a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the use of compromised or disposable hosting for malicious content distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://venefoil.com/ckfinder/userfiles/files/41876810089.pdf In PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816b65e161c---zudizizavolamoruro.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///20940911101.pdfIn PDF document text
    • http://kino-cosmic.ru/sadm_files/vumogisixu.pdfIn PDF document text
    • https://melz-feu.ru/upload/10039129268.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/xowosaxufiwutabobum.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/61031389286.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b906897e29b---wiwifikogokipexirox.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/rekimubozunirorelepazodu.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/n2r5j4i4c9rp9mkp5uu6j2vtu1/kifagavikug.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/kutamelibegew.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/lukutabomosatole.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/20700804752.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/78690981087.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075c246226db---22977658840.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/803335e5cff993c6eea5b4f7ef26a79a/14953221870.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/mimusuxuviwope.pdfIn PDF document text
    • https://dacola.com/upload/files/61145223982.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d08a9d44748---dilagoremi.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/dofibiju.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/pusunomexulezup.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/turutowotugepemebuxam.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/kijezuvinukugimi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=what+is+identity+vs+role+confusionPDF 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_off0000b391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB391 10844 bytes
SHA-256: d277156d915eb60972d96dbd16456d0fd2978fe4b0301de757afca0634378a9f
font_01_sfnt_off0000cc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9B 16508 bytes
SHA-256: 906bf43e9e6bc6128dabd79ace89e077c65beb79f6223f577dedc29ae8dc6d97
font_02_sfnt_off0000f432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF432 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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