Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a63ad38e21c95a…

MALICIOUS

PDF

87.1 KB Created: 2021-07-06 10:27:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 31805248bb958f86a43f38659a3566b2 SHA-1: c2853d34ab91516089366750a9ed4e6e73ee7018 SHA-256: a4a63ad38e21c95a422832298747fc552baed8b03fa0cf0f7a37a3f03474df37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

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 https://smidgel.ru/uplcv?utm_term=i+just+want+to+thank+you+lord+for+every+time+you+heard+me+pray PDF link annotation
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160751d0b4817a---lusizebijorigukorobal.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609874091cda2---69336462689.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/14720001360.pdfIn PDF document text
    • http://edgecs.net/documents/ginilapowatanufewexovan.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/dfd9804548b0369453f7602ee7ef6595/13464368360.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/35ffdc2867ed19e1107bea24c540a9c1/97846489460.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/7as5n69um395ton9d40to2hcdh/29567968537.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/6ba8d12dbd434a2e2b5c4a9679514b78/vetefijajopikuzigoma.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ea4ded044---jalonufulutefimetobemez.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/85798531527.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/gih8gioq452fcl7q1h5h4tiodo/7282428189.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/bh5s31u5hjovuohtp8ujfdo1hk/46102683961.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160acf46d25092---dagizenamo.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f53c81e19d---23452475590.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd545d3cf33---88039120121.pdfIn PDF document text
    • https://actorconseil.com/files/file/74816831707.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/25757967105.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/karikokutefibovu.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d33d2f1890b---75923461632.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/a2f532d7aefcf1c9ae46978d721a06d3/93886838923.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/zusuli.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/42324567221.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/8411127291.pdfIn PDF document text
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/torozepibo.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/tebodisifijetenivo.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_off0000ef36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF36 11300 bytes
SHA-256: 2b11677684922097d18ecce233b53838fdd7dcba43c5ac713f0ce83c41e576aa
font_01_sfnt_off0001099e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099E 17120 bytes
SHA-256: 2ea5eceeb10136b1dbb6629b61f12f7c1dacd1f71c02bed6a8321c140d0f0cc6
font_02_sfnt_off00013619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13619 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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