Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d298199bd8b2042…

MALICIOUS

PDF

95.0 KB Created: 2021-10-06 12:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 73fdb7e8486956adf6ac70276d3a4193 SHA-1: 9853ae3b0a54823d58b886d2017bced6c6d337e4 SHA-256: 5d298199bd8b20425de4a6b148da2ce5ff465e8f4f13a07f49e82f26623bc632
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it is likely a phishing or trojan delivery mechanism. It functions as a link farm, with numerous URLs pointing to compromised or disposable hosting, designed to lure users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://theshamrockpublecco.it/file/gurafemotewilum.pdf In PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e37f44c3de---82883228080.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/16009700308.pdfIn PDF document text
    • https://krusomying.com/data/file/91234636688.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614927aba4866---getonoziberub.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/lisonatasemapupogagafoso.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///76867752454.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/bocccui0vkc3dmv0ifpdtqdop2/60991142262.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/93268064639.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/28891409336.pdfIn PDF document text
    • http://sushifactoryazusa.com/uploads/files/59343169328.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/22103245115.pdfIn PDF document text
    • http://sasalidayanisma.org/uploads/file/93293352545.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/buvixiw.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/vusiwujuwopiwugufilakanib.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/63173262200.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/tewatobikive.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/71039382903.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143713d6fe26---moxetawolekakuwedilomug.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/vitanosifilojexokanuwimag.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/37637276604.pdfIn PDF document text
    • http://isotech.si/uporabnik/file/ramukakej.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/5738952657.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/40705708348.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=game+of+thrones+season+1+episode+6+parents+guidePDF 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_off0001093b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12152 11260 bytes
SHA-256: fffbcf0ea0d558228e9df4eeab6cd5453f78506961da4e42a9d1affd14479e12
font_02_sfnt_off00013b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B6B 19272 bytes
SHA-256: dc7794f1e8ea6eb9b9fc329aed2a5e9179315c845c5b40c8ca4897696cb43539

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