Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bf1b7be327664b3…

MALICIOUS

PDF

92.0 KB Created: 2021-08-03 21:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6782e25d3db99d06e9fbf66e32266ed9 SHA-1: cc6d495a9218679aaa46dcd3366db68628fd33a6 SHA-256: 0bf1b7be327664b3d7fc5c0d2d248f393dcdba38bf93e6e861606ae0f669c18a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure indicate an attempt to manipulate search engine results or host phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://aristosaigonhotel.vn/uploads/files/gomuramo.pdf In PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070b3a33f43a---63012295869.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/45498611148.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/51094368110.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070f7acb8b18---67318703168.pdfIn PDF document text
    • http://metrokentakifinan.com/resimler/files/97677825424.pdfIn PDF document text
    • https://dafelia.com/files/zufuzeba.pdfIn PDF document text
    • http://amdind.com/userfiles/file/82190632773.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/sujaro.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/nagikituf.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/62087638235.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/79552854061.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160812a75882af---85414894306.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaa6b4f948---35356680495.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa7f35da30---38129042665.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///dofenino.pdfIn PDF document text
    • https://songhong.info/userfiles/file/raveku.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/mulekurujijumevozejusenu.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f30caa5e9a---94252251570.pdfIn PDF document text
    • http://greer2001.com/clients/e/ea/ea56749d84c1a2d7db36d2c51c833a37/File/mosufuxamimupumavu.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e977d07491a---12505069946.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/16846806411.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=gigabyte+z370xp+sli+pricePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99D 11124 bytes
SHA-256: 9745ed3d15a00a6f8cf9d4b832f0ef9788fed60eb2109b903b6b26996d22b1c3
font_01_sfnt_off000103b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B4 17996 bytes
SHA-256: e045e6b3b024fc7fa2ae67e828ed1412158ba05c379f9f83f483d47fd4272f87
font_02_sfnt_off00013375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13375 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B86 16300 bytes
SHA-256: cb22297cb345efa2b973a5529f7d34f362c2fa401ecec879e64cb16b1dda6a81

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