Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfa0852af3efe988…

MALICIOUS

PDF

84.6 KB Created: 2021-09-17 20:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a450cc3e3ef656d8396c800271079609 SHA-1: 3dcb19c4f736694b494155b3d9154e5e34620ab6 SHA-256: dfa0852af3efe988aad8e4b9d4a3fe21051ad188ded312032501e1c1839ac624
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 or disposable hosting domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the links, and the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates the use of compromised websites for hosting. The document body is unreadable, but the overall structure and URL analysis point to a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://ises.smithpressautomation.com/phpsites/vertical_living/uploads/file/62503905355.pdf In PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/salunimojiwefigagomemota.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/xojomuxoligetixefakonofed.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/40959236560.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136af0b0115d---97193897011.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/fanuba.pdfIn PDF document text
    • http://dsraxys.com/uploads/walubifeje.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/gogezesorux.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/lizomipirafebamufepiv.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/zofaragoru.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/wupileworudulibiru.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/liwuvukawalinowojudatige.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161370792d8cbd---51857926037.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/82817316403.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/wuwugubarasomapovan.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/wofet.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210913193625.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/4396ba988b1273ad90e998115777590d/dulusilari.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/17072505068.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/kivatixedet.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fc9dad238---2595442330.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/dubefedulexesanivi.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/29704254917.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/67490158890.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/50021779035.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/xalolodizakewimukevin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=csr+racing+2+2.19PDF 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_off0000e3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBE 18944 bytes
SHA-256: b57384c41c9cce99d19c07dc0e75cd179e5a3f9e2c3167a72ac46dcbecd71134
font_02_sfnt_off00012c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C98 10448 bytes
SHA-256: 515da6d7b1b6bff04ccc41c6bbd156b06cae264a2b7778c7518a865c7da8f2be

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