Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6fed1a286429746…

MALICIOUS

PDF

82.0 KB Created: 2021-09-07 19:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 45d99a685610ab3b918d87f768c77670 SHA-1: 131b87cf06c37f043235a230ef09e53848416d29 SHA-256: d6fed1a286429746e8e896fac4c03d77bb4173c46938b82ef7beb15c81f8a949
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure as a link farm on disposable hosting further supports its use in malicious campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://emurus.jp/userfiles/file/tozanu.pdf In PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/risixufikamebonabokagizeg.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebf0c7e3dc---42672908989.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/c5d06f94b55bf24cb858e28ba73bb495/66235045142.pdfIn PDF document text
    • http://etnorom.hu/pictures/20096877250.pdfIn PDF document text
    • https://oferta.lt/i/File/nobewigokarevana.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/gikureju.pdfIn PDF document text
    • http://splogservice.ru/content/files/21908512553.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/sotogolo.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56d1230116---vokobolifuzifoge.pdfIn PDF document text
    • https://webhosting4.net/media/file/57577877429.pdfIn PDF document text
    • http://ubest.ru/images/file/jukafuw.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/89274568333.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e58a72fcdf---92945714082.pdfIn PDF document text
    • https://maria-galland.ru/files/file/58208156791.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/22401019585.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/bifomutali.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/tudanugazugezejidinu.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83db170fff---rixexizupepuzokopele.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/ijkteoefc6kjtnq8an34a3b5tr/kuxubuninufawogamamadesi.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9429e08df---nuwumexosul.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebe55910ff---4604688691.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609411af5b4d4---kizolutekejepevaxokiz.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/bufivabokevapozatomuti.pdfIn PDF document text
    • http://termocity.by/pics/files/fudotejawofe.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/bivezima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=mba+event+management+syllabus+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_off0000da28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23F 10944 bytes
SHA-256: 9b3cb68b9ecb7b5a0fc33ec336ee1dfce7c514530653a02583212a91c06eff4c
font_02_sfnt_off00010b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4C 18028 bytes
SHA-256: ef2143aae46ce534a2c24090be4adea011776ba567396d21912582db1370c703

Open this report in the interactive analyzer, or submit your own file for analysis.