Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ab5d32d434241da…

MALICIOUS

PDF

127.6 KB Created: 2021-06-26 04:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: ff09fc0597ecbaa10c835f2c50ffaa4e SHA-1: 2a86894ff2db4a69381bf5be6d8160d0844292e7 SHA-256: 4ab5d32d434241dad25a39fbab088d9d5b854a8233cd27fcaa7842e4d53f5622
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics points to the document's role in directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://yachtandgulet.com/userfiles/file/15582005470.pdf In PDF document text
    • http://classtool.info/upload/files/wivefazajolu.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/juwoj.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3676003578.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/35772538166.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/zijivixamikitesovidud.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a78525c6209---18440988033.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/93739fadcc123584620d8f29d64b4ba1/magagodadawe.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/goraferinozuwovidekuvami.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/kezafimawa.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/25098475390.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/pt7md07k37uqt1dmkv7hbil8gn/89244244932.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/42657948494.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/51835671168.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160969958be98a---59332947842.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9c15f376a---ritesitafeguboxeteluw.pdfIn PDF document text
    • https://ancoraeducacion.com/images/torozim.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021052011174050.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094616e70a81---texipuwuriverumusitivurox.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/39985539107.pdfIn PDF document text
    • https://ka-base.no/images_content/file/tobolo.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/2065c925c1b9c1833d02f92109c5b5c5/89716899625.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/bf4dde74157dbafba654ffa4ccc58aad/60289697830.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/51463917536.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=automatic+identification+systemPDF 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_off00018f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F15 18508 bytes
SHA-256: 8c4f4691405644768edc926a3ffbb1d779d022c3f4c5dae4e69e198b7016b9f2
font_01_sfnt_off0001c00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C00C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001d823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D823 10688 bytes
SHA-256: 4a8fa31657a62b49e345222d5eb9d7c70d90715a969c98e6c42f4c1e70f69cd2

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