Malicious PDF — malware analysis report

Static analysis result for SHA-256 e93c524a286cf129…

MALICIOUS

PDF

69.6 KB Created: 2021-09-26 21:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 66c65be6ca10d70d78c25eb89e64e3a6 SHA-1: a6d069772f1f20074d355b7ebfb06c61a159a628 SHA-256: e93c524a286cf1295cfc1277ad6a7d8aca8f056d8de4840f30449e92cec11545
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly indicates a phishing or malware distribution attempt through these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://garglob.ru/uplcv?utm_term=best+sketching+app+android PDF link annotation
    • http://wsp.pl/userfiles/file/wudojeneloduvetutag.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/gerezoxegepajosumegovax.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/33031798625.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/rugepivedibudarawa.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/2970323015.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/tonemodivenetopavefuguwe.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142375bbc88d---34315577916.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148c2e508db8---tupemufefuradewabimow.pdfIn PDF document text
    • https://kapefashion.com/files/files/kezujokopikemexatetube.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/32869435161.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149fa2e83fa6---kokapekov.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/65134278014.pdfIn PDF document text
    • http://iccarrentals.com/files/file/7353195222.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/xibegowobibobonise.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/golidigemewifosita.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/kesedemilun.pdfIn PDF document text
    • http://kotolantopeni.cz/file/jixanexegasiku.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/99613918697.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/63768141855.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/97486263256.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137603743beb---guzivolezeduk.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/96767496815.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae083671fd---70369021830.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_off0000b1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1AE 15164 bytes
SHA-256: 49866b9862dd85f34a5b01995357e3a9ac1b60382bc535ce9dcd7d3414b53b8e
font_01_sfnt_off0000d77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF96 10892 bytes
SHA-256: 98e16528333cd5caafa1252ef6217436a8b77a2578bb8b6866e979d492c2c0f0