Malicious PDF — malware analysis report

Static analysis result for SHA-256 605da200781af974…

MALICIOUS

PDF

97.7 KB Created: 2021-09-04 04:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 770c2d6f2eda5aa3d8e43a28dcba685f SHA-1: 34f224f23de9891802608e9e8eec406e79595f5b SHA-256: 605da200781af9742df0906d7843b516f6172bd571ce112bc5b938ca41c0e25f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://garglob.ru/uplcv?utm_term=commonly+used+english+vocabulary+with+meaning+pdf PDF link annotation
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab928a6e76---37693254174.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/99585956868.pdfIn PDF document text
    • http://apelasyon.com/img/userfiles/files/70893216973.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021061204533834.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/povivisijejamuti.pdfIn PDF document text
    • http://grimastone.ru/files/funaxanujepolizen.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/panisova.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/koponusobaweduk.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/xukawera.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/7530332798.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/161068ca508c73---8883778941.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160839465672ae---kekewirazalol.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/sonexaterujodib.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/jatugizifinap.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160877fb7415da---63956745170.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/81e8ed16dfb971a3cf727da88c836be0/xizezo.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/juxolofa.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d07f0f4e4---50456166476.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/55355555891.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/zibumilanumerasibewurata.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/bec0buisemrnr7gr7s3nv33oia/68375618432.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/br0cimtc2rpfh8gl476hhpu7vl/72162421203.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/satud.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9f1d41659---57487987288.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_off000114cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CD 18712 bytes
SHA-256: 9c9a959c460092b6f1bcc6cb8f10350e9f4a403e4966b82100a7663aa78bfff0
font_01_sfnt_off00014536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14536 11604 bytes
SHA-256: b5f83a72f664b65e62f3f3ac0469aab5a3b97bf5d714279bcbf15d5a8ac33aca
font_02_sfnt_off0001603e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1603E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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