Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bbec3b05a488751…

MALICIOUS

PDF

95.1 KB Created: 2021-06-30 02:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e60a8ce88673f2f2a36a50f19d219e5f SHA-1: 544106ae3fdfbc6ad17d07fce23380b9a03e4154 SHA-256: 5bbec3b05a488751875983b5cb0386805a7965dae9cb0802b7c0874861d0b933
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, indicating a likely phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of many external links suggests the document's primary purpose is to redirect users to malicious content, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 6

  • 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 https://cructi.ru/uplcv?utm_term=pendulum+which+way+is+yes
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/a540cffdb85d28d031c1f474ffacec9d/wiraxafunefoxuridino.pdf
    • http://www.emailposte.com/pictures/28067598722.pdf
    • https://usssecuritate.ro/userfiles/file/50487182945.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076d7d29b76d---22384536714.pdf
    • https://arab-hams.com/Ups/files/vomof.pdf
    • http://www.niziointerior.pl/upload/file/96920670619.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/f25fc84c7e72cd42b0c6e6802041f1f0/65880629102.pdf
    • https://gyandeepjkss.org/userfiles/file/dobetotetej.pdf
    • http://sammyuriasproperties.com/userfiles/files/gojifiji.pdf
    • http://mea-travel.pl/userfiles/file/petepavegetug.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b69116d05c---demisominoporudagim.pdf
    • http://agro-pasz.pl/ckfinder/userfiles/files/ninesimerevo.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/jthg4be1krl00na05csj2ugqq5/gakidetovorazosijogusak.pdf
    • https://clumba-indoor.ru/files/files/pemadisa.pdf
    • http://ferrogep99.hu/static/media/file/dobevutofidegoxado.pdf
    • http://novussiteyonetimi.com/uploads/file/tinuxaganazusez.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086ffe160713---zugag.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec464e55d9---zimifijobokinulubuwopikid.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/496a16131a2e81272b9cc232e0d4fb43/66279367748.pdf
    • http://acecaalcoy.com/userfiles/file/larelaxopimatilafogef.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/n6ttj52m8pbco0c20pgpgfrm72/rowovububureboluweto.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/hnch7q7hsqhjg6qlvnvq5qimt2/wiruje.pdf
    • http://mikomisushiwc.com/uploads/files/lujafinidunowipuxajizosi.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/0d10decd4e8dff552918558ef9d6989f/73939247965.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa78.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA78 16792 bytes
font_01_sfnt_off00011289.bin
559a9dec238984ed6e6e5afc241285f70db6970ad113746013882d6638521473		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11289 16500 bytes
font_02_sfnt_off000129aa.bin
902f1bd9e9bc1314aad114e5380357a6288f8bf4611c7345d5fe7c9c517e3f60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129AA 10620 bytes
font_03_sfnt_off000141ba.bin
b63c324107754023a88c20a2a387a80181973383ae2d0ffb25958d1e4685b001		 pdf-font-stream PDF embedded font (sfnt) at offset 0x141BA 17260 bytes

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