Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b46bcdeb7ff44a…

MALICIOUS

PDF

74.2 KB Created: 2021-09-15 15:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 327e23e161ec04a2b801a6d75bc13c6f SHA-1: 0af5df3a71e5222ca59138d92d7fa0e8a2204220 SHA-256: f5b46bcdeb7ff44a6d73d09225394b5a1cd2477d5c7fa6056febafe59aa1fd65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. The primary purpose appears to be directing users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://philabc.ru/uplcv?utm_term=lottery+results+app PDF link annotation
    • https://amatnieks.com/pictures/image/94999977754.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/ranetutiz.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/vomagexanidasuxetor.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/zoxofobetonoritiju.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/51984947636.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/e6395468e6df2a66f7bad73ec3326a34/38453436948.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/14338829911.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/daxelexerudijivawokemopi.pdfIn PDF document text
    • http://aa-nusd.jp/21283554898.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/28726547307.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/95698621936.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/difasup.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/vexamisagokefanemebitota.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/53597323633.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/lotezixesafumatirefudo.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/mexopojubagonogoranepovi.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/tojavow.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/janigiditadajon.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161339781405d3---bikabuwedakabis.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161347f8d08854---78738654032.pdfIn PDF document text
    • http://195exim.com/datas/files/54863416724.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/161357cc016430---7657321137.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/49495991306.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbe7705cab---malovisomi.pdfIn PDF document text
    • http://actinq.nl/upload/file/kakon.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/gepunagavudoxaboragidi.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jifaxegepe.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_off0000c0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D1 10220 bytes
SHA-256: c366ea7ceb505c85cbab333458d62cf38f0ab0b6c436316c52a30256da159758
font_01_sfnt_off0000d803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD803 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF015 16868 bytes
SHA-256: 266684988b3ce3363ebde53f43ece4aee9f5a95e6305be80bf3b36bee6c4dbc4

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