Malicious PDF — malware analysis report

Static analysis result for SHA-256 78e4ff864a9a5201…

MALICIOUS

PDF

81.7 KB Created: 2021-09-08 09:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a0a81d8ce7829714ee443d1ce3283c34 SHA-1: 1e6e8bfb77dcc10aef002ae3dec0a6acd2924dcc SHA-256: 78e4ff864a9a5201e9b2b4d85f428d290fd291425a5325445c65ededdaf28a76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://khonggiansachhanoi.vn/uploads/files/lizirepaxedilipasab.pdf In PDF document text
    • http://stopguepes72.fr/userfiles/file/85527987012.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/22906333702.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/b0130d99111d7e2211e5a7b87e826ab9/gutilun.pdfIn PDF document text
    • https://eminesenlikoglu.org/resimler/files/48053273416.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610523f1c9ceb---delijagalazabu.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/96981017285.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/qm0e09jqps3ujll0nqc60gqjs3/46240321378.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/66429696346.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/2006735732.pdfIn PDF document text
    • http://wedding-ideas.ru/ckfinder/userfiles/files/sejefuxibiwufelagutelegi.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/dafudebarizijusu.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/95103890690.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/72961489372.pdfIn PDF document text
    • http://rford67613.com/clients/a/a2/a20594cba7d6fe247bc87ef9b80620db/File/24025473069.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/51849724708.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/17933395829.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160926ae9a478e---bisatowiwitizori.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/8cc3d44ea09a8caf51d81ea09af4cde0/fezawezukurovidofufusigu.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef471b266e---gupas.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/lamuwonaribozebubizexir.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/65eb518de25999c785c1eb12e10215b1/xinejepira.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/purubobazezesi.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/61852532314.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/xepenan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=resistance+temperature+detector+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB21 21432 bytes
SHA-256: 369cec8e954be858cc50ad975c2883824a1c2e716378eddb96590e04ff9aec2c
font_01_sfnt_off0000f200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF200 10880 bytes
SHA-256: 52ded3026ec5512d4f748050fd2ed7c8bf3de5bae9b03d72f5e16652e98cb07e
font_02_sfnt_off00010b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12337 16128 bytes
SHA-256: e086d997b6ee3c3fe48f8fdf49e8854b9e9bef9c53b5c2c5f26bba4f2b277426

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