Malicious PDF — malware analysis report

Static analysis result for SHA-256 df244e171e48f8ea…

MALICIOUS

PDF

94.0 KB Created: 2021-07-08 03:30:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: abe55909307830769235b263134762de SHA-1: edabd1fae5a73266ac14e8843514db098c9ed48b SHA-256: df244e171e48f8eafb1548699721f1f78fd49b55b15d484355abc9f76e495695
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, 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 potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62c45220b5---ronezumuvefuwu.pdf In PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210626_5A1E619416483896.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021060210150633.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/weludelojaxuxige.pdfIn PDF document text
    • https://ikima.fr/uploads/file/zigepusinujik.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/56862934821.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/e9e2824082adc884d708213a1b6b12fe/lalubojopezi.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/f18313e655fef0fd9ec95ae6609397ba/veruwatovasebeluxizegu.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/webidugefoxunigaxi.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/30403027328.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/wazomivazigevujok.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/788065789.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/rigazenaxuvebitogusi.pdfIn PDF document text
    • http://didopack.com/files/54514813631.pdfIn PDF document text
    • http://yuha.be/_files/file/teduxedonalubumudebubeb.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c51f7724b39---zovajo.pdfIn PDF document text
    • http://indecomavo.pl/inc/98749710522.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d83a5e90f9---32564388768.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/546f658f2d66c017e8fb10579ed114df/71339004842.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/17341907490.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a5cc8df5a---7443122661.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/2973975defb10bcda6d231d7ea4a4556/texubebujepidokopek.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202105280003378968.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f99b9a33d2---5629507107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=anterior+wall+of+heart+blood+supplyPDF 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_off00010c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9A 17060 bytes
SHA-256: eb1bde5e421c111355a620ae8ae4048931c762db5a922b12530c6682720c1072
font_01_sfnt_off00013939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13939 11016 bytes
SHA-256: abd3919c40caef3d0723b1354bc5a63c409433c31ed25bdeb2354d431125ad40
font_02_sfnt_off000152a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1