Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c69205503b59ad…

MALICIOUS

PDF

85.6 KB Created: 2021-09-04 19:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5ffe5293d8ab5b1664e5eabf0e1f8522 SHA-1: 828e923dece9299527cb534003779308811c82ca SHA-256: c5c69205503b59adb032d6c69047163eed58597056cdfd6a2990b3c0e2e5c4ea
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 multiple heuristics and an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://apartmaji-zunicmile.com/uporabnik/file/9413461979.pdf In PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/dojetafopezokexigis.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/37096dfcf4f3eb0afff12e66abaaeb9c/44065069971.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/08/02/file/20210802_160738_155.pdfIn PDF document text
    • http://camwater.org/media/files/safujidul.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/fitura.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/61826332785.pdfIn PDF document text
    • http://dongxuyen.org/upload/files/84512159099.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5449db7792---44659527892.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///36482637114.pdfIn PDF document text
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/74215800428.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/140d02c8dbd5ca89c01749910a240aaf/jerutanalodirefosipowivo.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/57413743149.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/xogaziz.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/ec3bae3cc14a7cc31af193f7eee8f69b/vurebaxurunitepapi.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161203665b302b---734158374.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/96219253161.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=elements+of+programming+interviews+the+insiders%27+guide+python+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_off0000e5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DA 11328 bytes
SHA-256: 2b8230598ce7ad0e92629cff199c4d6a37a2ebcfd2bcc94c6fcd616b49e4edbd
font_01_sfnt_off0001002b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002B 18328 bytes
SHA-256: d8577538151fcc96fabb36eace952854c17d5fc4b766121947a6203b8e4af85f
font_02_sfnt_off0001304e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1