Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b73b6f5c7590707…

MALICIOUS

PDF

70.7 KB Created: 2021-09-04 17:38:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cef158518da659afc56957ac6ffa425c SHA-1: edc91743c58716d30f8e3e974d2ed2bccb861d92 SHA-256: 3b73b6f5c759070794279a594fe1e10ff447bb94d5a9703395df6a9cf38fa842
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a likely spearphishing attachment used to distribute further payloads or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://philabc.ru/uplcv?utm_term=per+la+gloria+d%27adorarvi+tenor+pdf PDF link annotation
    • http://southport1969.com/clients/861680/File/81494219864.pdfIn PDF document text
    • http://iringmalaysia.com/ckfinder/userfiles/files/93204790414.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/253kp53l7sh7ua2bp7ubl441p7/kejavatadofawonojirifuj.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/5956cd003f215481306b4802b25377ae/46020079193.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3b49bb280---jovekejur.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/wajegogixisanevefu.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160704f5546171---68881034296.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/tojexirawujerat.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/bazuralovop.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/61196167463.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/rasefirupewuwejelupoxe.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/7423b744d884701f5d052b2a31b5859b/sazazugiwaw.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac592bf102a---lebozuravoxasawibuxegun.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/wuwewato.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/r8hvr758q5o04codijaijc4vbr/65060693373.pdfIn PDF document text
    • https://deepex.hu/hirek/files/dezeweboxazopize.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/1461401966.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/76d9df9a4f27e47127c9add862502776/revew.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d7de261ad---53345044171.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/57867021916.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/5b9f95675eaee596e8c8735252725250/2410070375.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160703619c0a54---wemegutuni.pdfIn PDF document text
    • 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_off0000b4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F3 10604 bytes
SHA-256: bd883f18df28c41b35b4e3bd7c1672fbb43137b440e83f4ed4cdc72ffd385bb3
font_01_sfnt_off0000cd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD16 15732 bytes
SHA-256: 134e41dd5ba609ab99527b33ddd8203116165619a06fe4d4396de387ac14b5f8
font_02_sfnt_off0000f539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF539 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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