Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dbda73d2df20744…

MALICIOUS

PDF

80.5 KB Created: 2021-09-04 05:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 63ad9e57a9e66805dac7eb91047bad1e SHA-1: 2fb5a3d7aa484cf6bdb0c94f45bd457c703fdb96 SHA-256: 2dbda73d2df2074412d3c97339dc3dbc588d94717e2b9cf607198af6f932a2bd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading a secondary payload. The presence of embedded URLs and the nature of the heuristics point towards a phishing campaign disguised as a syllabus or document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=fourth+year+bams+syllabus+pdf PDF link annotation
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105b06d3f395---4942762254.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160cce9f76ac0a---talomo.pdfIn PDF document text
    • http://dhs1959reunion.com/clients/871764/File/32563801070.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/ef6618d76cbf521734c4824c51a8d97c/5006015218.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/17315229189.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4a910bdf8---48163115518.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/q7ncq2lt660k16sfqs0gjjs5e7/83168846191.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/nerupavuwapigulenizapeb.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7432d1978d---zexolujalipivefuk.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/57694980464.pdfIn PDF document text
    • https://12waktu.com/contents/files/gividodejafut.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/jevusi.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/figuki.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/ruzanakepo.pdfIn PDF document text
    • https://pepsima.biz/files/file/12406600777.pdfIn PDF document text
    • http://jkohut.pl/file/zowirozezowamuwixum.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/88039747603.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/rqmqa0jm5qd3c9h39rana3qdk4/98425246339.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/sivelok.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096d6683068c---xebunu.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6fcf87ed3f---pipogilo.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_off0000d81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81B 16608 bytes
SHA-256: ddf1ffc0eaac3c6b31d805f30b62c943b933e8db6f25f17bb89264a0b9e69f49
font_01_sfnt_off00010337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10337 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4E 10900 bytes
SHA-256: 4eac5ec4f58ec66dd52dc4826b88f46252f73a50af123d689dd4b086e867bd51

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