Malicious PDF — malware analysis report

Static analysis result for SHA-256 d627e82e90a8731b…

MALICIOUS

PDF

90.7 KB Created: 2021-07-19 05:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8083c3fc63224c84b3697d1849048375 SHA-1: da05b00a778adc21b9ca098dd55b5a03a666cfd1 SHA-256: d627e82e90a8731bedc50777d09014dff8f73ddbff9ef1d8073455cd98f46282
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on compromised websites. These linked PDFs are likely designed to lure users into downloading further malicious content or engaging in phishing activities. The presence of multiple compromised CMS upload links indicates a coordinated effort to distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.umadai.com/ckfinder/userfiles/files/nemilibefimexoraluzeseme.pdf In PDF document text
    • http://namuvaldymas.lt/userfiles/file/lumisi.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/q2esr712cp0ui4nls0q9jrtadt/poforegaliboxid.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ec57a48e8---51038445457.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/f074dd502e083b646563cedd95f88277/70086607929.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/bidasadamoladimin.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c3dd9e30f---simasamozarolobabezodafo.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/wubojapisozigajew.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/ttga8ttnoa9aguu2aq8cm9rgvl/bupumadazojavixekupib.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/d025ee37dfaed79b3af53e6f0957f5d2/60446268096.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608064d700c95---25025897912.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/dujanusakopademamodanigo.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/55a4cfcc6ae1ed2111d1b3810478b3f0/25415628798.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f35b07f8c3---79320704543.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c656411300f---27269126499.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/netod.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/womuxapuxorajukuzijoz.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/a86ced77fade246634301afd322b41cb/mixibotafe.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/48649623204.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b69d62c1b---55444740922.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/2475266841.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d9f006cca4e---90777122508.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16089ca83f2886---3787107520.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=fish+every+dayPDF 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_off000103a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A9 10136 bytes
SHA-256: f0fff055234ef7526a637c483343f14e39c869857cd6b72a5293b52c9601ea1b
font_01_sfnt_off00011a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6A 16776 bytes
SHA-256: 9fda07a1e2e5befe8593b5ad1355d4662c737d40dce1712fde0954515d6c91d1
font_02_sfnt_off000145f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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