Malicious PDF — malware analysis report

Static analysis result for SHA-256 893dd42ab74ef907…

MALICIOUS

PDF

87.0 KB Created: 2021-09-05 23:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: a346538fe9dce7ec67f3436d7d8a6ec7 SHA-1: 2af9139ca01be096ae0c23f44c00b5b0c8a7e154 SHA-256: 893dd42ab74ef907de0327bc424b3b36612ec722b52c96a2ec7bee8a935dd4d8
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, which flagged it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised or disposable domains. This suggests an attempt to lure users to malicious sites for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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 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://mea-travel.pl/userfiles/file/budujebevinuvagibopiliz.pdf In PDF document text
    • http://ithaca1960.com/clients/8/87/874e400c25abfb160fd1c0cf9913fcd0/File/15922555288.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/97067136269.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1132519320609d4eb446cf1.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/15533618209.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/dejedaxiniwuki.pdfIn PDF document text
    • http://ty-int.com/files/files/fizenagujazebexakikajo.pdfIn PDF document text
    • https://orangerun.re/photo/files/72135751495.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fc1a00a2e---juteruwadisekuvuzujakuzas.pdfIn PDF document text
    • https://arendic.cl/files/wojebavovavo.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/temimajapiwifize.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a05265107---65069720631.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d649b5f1ace---zitojatibadovafo.pdfIn PDF document text
    • https://kamarkosong.com/contents//files/jerazasidoxokeredu.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/52d70c2cb1e647e1a22dec2873b9f9f7/jowifatusose.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/5i5cc6kcgen4go3n2vg1ovbkf4/81706268454.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/pofukivogisitodoliliwe.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa6240d72e---lejomusunisuf.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/jaxadatupomiledak.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/vuzel.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/60175598748.pdfIn PDF document text
    • http://vejwun.cz/images/68716698512.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/36700832153.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/3955301201.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/fuzupojinemojujuxafalula.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=listing+agreement+sebi+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09A 10772 bytes
SHA-256: 64f72cd9e993cbdb6b74aaa3aa8c302f6c6017879a195895a7f7d9d618f5d5b4
font_01_sfnt_off000108f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F0 17676 bytes
SHA-256: 18842eade3840261b0eff67a015792206af4871d327ef4f3120d53bde31c17c3
font_02_sfnt_off00013653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13653 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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