Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb6361bad41e302…

MALICIOUS

PDF

82.1 KB Created: 2021-09-02 18:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f365ec99b70800556f8de12e9ba59ce0 SHA-1: f290dd6613e26ae3aec1bdf370409bb8c384cba2 SHA-256: bfb6361bad41e3024e9e53c8e8d2fc751740dd5ea73d104df768a328239a45e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, some hosted on compromised CMS uploads. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://secureyun.cn/uploadfile/file///2021083022512475.pdf In PDF document text
    • http://laclonghotel.vn/upload/files/94242513144.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/28849784633.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/tulas.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/josupebofabipu.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/resaganisu.pdfIn PDF document text
    • http://jkohut.pl/file/fafidonaje.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/i6ni5m7g8696lvigbgeriljtf3/83325141364.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/ec18b28d4a0a0b93ac0b74d560740205/38273606251.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610144ae61f08---75163369875.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a587d12fdeb---gawozazatirojesafenas.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/vologosuxebuju.pdfIn PDF document text
    • http://lovellreunion.com/clients/4/42/420738e4954c29d3cfd02fdb1bc9139f/File/94448745009.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160947d2b0a3a7---16878365046.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/71161790394.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/c8ab8ee82fe4fdac41cf1ecd1ae32e0b/86226459531.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/cb55e308b13c5605c9623c97ecf52e31/moxosajesabunelavetogid.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/vumoj.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/nadunezegisowifa.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/sutijevidiwevufupewezipi.pdfIn PDF document text
    • http://scpt.it/userfiles/files/83640636135.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=hornady+reloading+handbook+9th+edition+pdfPDF 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_off0000d7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF009 11116 bytes
SHA-256: 8a5ae74a86d28e04e6f6cc5f8200154cf0cd138e406ef1fb58510dbe7b533feb
font_02_sfnt_off00010967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10967 19156 bytes
SHA-256: efce5fc55e04ac3891240ffe1e43651ee2246555bc6d3ad80302c186f8cc91d5

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