Malicious PDF — malware analysis report

Static analysis result for SHA-256 e09d8d7bd02497b8…

MALICIOUS

PDF

80.0 KB Created: 2021-06-14 14:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 307f1adb2ebaa5bc1fdb8b267843d034 SHA-1: 252645ac3eeee64972321ecc90accdb4d2e90b9d SHA-256: e09d8d7bd02497b8a901b86b5b3b0d32ca6e681cbfbb86766ae882cf128c0e4c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to trick users into downloading a malicious file. The ML classifier and ClamAV detection strongly indicate malicious intent, with the latter identifying it as a phishing trojan. The presence of multiple external URIs and compromised CMS upload links reinforces the phishing and download lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pixomot.ru/uplcv?utm_term=download+sniper+shooter PDF link annotation
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/ae77b8bf392744acbafea3feaad65132/24386937939.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/mj5qun8hl10nb5p5s34sgiuj2r/13620836075.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/964ff5f5000d3cbab5c6b87aade39de6/7832600330.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/370b910ecf215e7d6a706bf0190a16e6/sijiwupisomebuvunebuja.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/56688339335.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/ldud260u0bife56ckufk0fqpr7/zomoju.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1b13dce47---kawenofebepuwovusolazujap.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607695bad5218---vidamimuvejow.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/olk16ia11vlqj3q8ovl1i8ekun/6282957728.pdfIn PDF document text
    • https://papiratisk.cz/soubory/26268956627.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/7ca3e4c3411fba4061ff02863cb1c35e/wozudesifelazozizejuwe.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/rdjmrj2kblmtbsa0b9au701c1t/20346004356.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/44041687352.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/rajg4r1kra6ep5m9hrfjumm9u0/nusurodopes.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/2ebfc92465d404629b6702da3daea62b/zijupexexojufomiwaleki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF093 2960 bytes
SHA-256: 3a99bfcc8a6322cb1f5d9dd0c76c95525b0630114fc12c53a342d41e6b6e0e01
font_01_sfnt_off0000fb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB03 5140 bytes
SHA-256: d05c7d7942fa4b8dc5624004e2c671a590391f352ebdfa5ad72852bb7c98b819
font_02_sfnt_off00010c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C91 11180 bytes
SHA-256: cd552448cbfcea229fe240d00e655f1017417a3b99780dd3d58726da56b7c413