Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f583eb65f57be74…

MALICIOUS

PDF

97.3 KB Created: 2021-09-07 14:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 35b866deeb727980221025404699c00f SHA-1: e28da2317c0d5c3a6a2bab4d60ffd03bf46bc2cd SHA-256: 0f583eb65f57be749e7dcbe9f15e2b4936f0061f39dc02b5887f4b398b66f3ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO poisoning by directing users to malicious content. The document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://sahodayabbsr.com/test/fckeditor/file/35347093686.pdf In PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/o21mne9ncmnr0ectrt6rcnpbg5/55576791751.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/99914873942.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f27938498f---24521503183.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/22298497983.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/gowakasizanozopot.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/valof.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b20d34bf044---roburiseguged.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/77527385972.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160df98d9f0f1d---wogalomujusewuz.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/3897191690.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161107b3f3b45b---72410387950.pdfIn PDF document text
    • https://makenie.com/upload/files/mitituvaxovedibuduzozu.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/pizibutovuzidaf.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/63512597997.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1626901275.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/dodugenodugalovusude.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b365b0cc73---32390358936.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aecd03ad5db---33848190913.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709d3a44fa3---jexufeleruvopoxeriluxif.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/godanewofitipofadomu.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ca70c2262f2---rijafilanifetexow.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b996c5b564---14322574296.pdfIn PDF document text
    • http://bud-drog.pl/userfiles/file/rupuvuvubovefusibulebapi.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/fnfhjpic44l7t1vvhgadoctqem/rilukezivufinavovimetuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=geographic+information+systems+and+science+3rd+edition+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_off00011338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11338 18728 bytes
SHA-256: 8037a0f688c3b96d6bd7f86c49278559cf75a5fab1cad0a7e42f6f2566c83753
font_01_sfnt_off00014475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14475 11348 bytes
SHA-256: ee7013220e41f0b7d1c0415c92bd2bed6a0d97128d00b859737031f945357599
font_02_sfnt_off00015ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1