Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6224d4c2d9fe451…

MALICIOUS

PDF

93.7 KB Created: 2021-08-09 13:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 48a38ecdf582a16f8ced25ba664e134b SHA-1: c9b9eb3717a26e402964de3d400aee9a6c4df7fb SHA-256: e6224d4c2d9fe45103403f753e746a0fd9b56a99fd7b166290e5724f850f2900
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm or redirection mechanism to phishing or scam sites. The presence of embedded URLs and the nature of the heuristics point towards a phishing attack vector, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://medvor.ru/uplcv?utm_term=how+to+make+lay+z+spa+quieter PDF link annotation
    • http://charivne.info/images/file/31635495451.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/91576399627.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/begunaginelu.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/33e2ce36cd051edfef37b39b46308407/relevivuxatibi.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/27776277232.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fc43938dc---31320424299.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/biwuvujezidunuwiruj.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/lamup.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/xipeforuvaponuwoxusisize.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/zodoximujidum.pdfIn PDF document text
    • http://randalljroutson.com/clients/44711/File/powibipivaruvib.pdfIn PDF document text
    • http://wamer.org/userfiles/file/6683649017.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c354086416b---61923969146.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe07aac69d---sisazol.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/75352224428.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/goletew.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/movuz.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/kategefevukufekuwojoriko.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a53540e06c3---63438166947.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/82469949385.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/lazomozegifiruwa.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160b4a09168f72---warixodebarogasinakaxafov.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/visateg.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/0b0f011e0d659b49d5628f87c394c11a/nomixefewir.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/5b41fedbc02b36e8fd81a62d279d01a5/vudijibezunobununotiloko.pdfIn PDF document text
    • https://drlanda.hu/user/file/68831802327.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_off000109f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F7 17408 bytes
SHA-256: 988c5ba8abf82a83a51886ab37cdcf6eefb5cf3122de87557b1669881d84d780
font_01_sfnt_off0001379a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1379A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FB1 10896 bytes
SHA-256: 09805923320c0c51dcd7a70c28d60f4925f2d9a1bc4d16fd147a5176e064b3fb

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