Malicious PDF — malware analysis report

Static analysis result for SHA-256 2efaaca5b80bf230…

MALICIOUS

PDF

83.1 KB Created: 2021-09-03 07:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 433b003b1bc9b50f234e6d9f11e7a052 SHA-1: eb1c94cea56e353255730710b7878bb2eb8e05a0 SHA-256: 2efaaca5b80bf230e376fe7a76a820381251540498b297498c45c77805c3446c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. The document contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://tonitomov.com/picture/file/kapukewoteletarij.pdf In PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/55351055327.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/vopuvurexonabidiruvilo.pdfIn PDF document text
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3455525363---53662377749.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/belowomejipakoruzoxovewip.pdfIn PDF document text
    • https://areicon.com/images/file/pekokirunotewe.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/72102054068.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/40038118347.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/farab.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/80e59d9b75b42cff4d0c45f65677762b/30981763221.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcbdf53694---felumivutakenuzo.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/naturevosexazesodajeribaw.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/30406560053.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a52601e37ad---toduxigi.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609484aa69f06---puvunezofoxiwegaxelivoli.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160892a9756eba---tubusufoburaruriteba.pdfIn PDF document text
    • http://llux.vn/uploads/files/82417783264.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/tefuligamurudeb.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///78005161693.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b097665838---13471318610.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/famevujiduzagiginixux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=python+extract+text+from+pdf+imagePDF 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_off0000db80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF392 18784 bytes
SHA-256: e246bf0d5116710ca317136fa408aef2f381e1603ce35ffeb995662a42e3f09d
font_02_sfnt_off00012533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12533 11068 bytes
SHA-256: 82f7d30cffba8acbea71dca8880277b5c7fecde30bc1aaec1fc1f2cf69a6b288

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