Malicious PDF — malware analysis report

Static analysis result for SHA-256 f77d5bd888e3621d…

MALICIOUS

PDF

81.9 KB Created: 2021-09-20 22:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 7491a4f49cb0d5637a2ee38cec5c7dd6 SHA-1: 07a5f7f3fa1d455fb9d30695358b218bfa2ec3f5 SHA-256: f77d5bd888e3621d1e770a18c60036e4c91efdf01fe0615eb4a1baa3d4190e36
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these sites to distribute content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://coretry.ru/uplcv?utm_term=pokemon+go+hackers PDF link annotation
    • https://rimsball.com/ckfinder/userfiles/files/ripiwase.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc4be4c65b---88740032984.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/gobazimowepuxog.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/33136048239.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/ponuniji.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/wajukejuloza.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/gakipologewevumurinipeg.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/d9b989fa2791461abfee1da73cddbb8b/67392172167.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210906012225.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/49946987586.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/94409744614.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/88956197598.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/suloviworuxagisiv.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/bakexuwamor.pdfIn PDF document text
    • https://onlinendttraining.net/files/21490909085.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/81091462908.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131041842e1b---30240978594.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/12961133353.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/motumetitegufupev.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/kejalereg.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/48370078168.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/neruraxelafigesuf.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/28847836114.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_off0000d94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94E 18788 bytes
SHA-256: d5e2361042f7406d8e284de77b32a949387c6177eb71bdee3b486cd4e48741ad
font_01_sfnt_off00010a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12269 10536 bytes
SHA-256: 423e0cc32bbbc2b34a812eb0ded3f085ce82e1ce18f31908e5d65f31a701a54e