Malicious PDF — malware analysis report

Static analysis result for SHA-256 feb9fc951068247b…

MALICIOUS

PDF

94.5 KB Created: 2021-07-03 03:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3e4b7a3e69a176105500cf0f5a51bf0f SHA-1: 5900d1fc8839c0914ebb90db32d08e37522200ea SHA-256: feb9fc951068247baf169c3299c2608470297507ea3ec67db7f5db4a4bbd5d55
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous links pointing to compromised websites, likely serving as a lure to download further malicious content or phish for credentials. The PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic specifically highlights the use of compromised WordPress upload storage for hosting 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 https://queure.ru/uplcv?utm_term=this+type+of+graph+that+illustrates+the+distribution+of+numeric+data+across+categories PDF link annotation
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160730b4a09c4d---movop.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/32028244506.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/33403538152.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/27caadca11e481f5c27dc4c71d64f020/pisozakuxelesitidobozeko.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/b18d0f9751e21a691aa710ab1676a6d4/71354923631.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/44795412916.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/970ola1dofmo53ar02bc81qmoe/59440187669.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/b0m2dontdn6dcsasf1o38gb8e2/55589485948.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/zurivebejuset.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/d3495754f910da118142d46eebd38b2f/98305451813.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/bewebofibuzezafet.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/usa4jh13s291trlt302636ai4f/289372808.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a24e439a6b7---meweludilodukureriken.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/95720677744.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/9929f7432ae0d3f65fa409fd21374391/99520439006.pdfIn PDF document text
    • https://landbar.com/upload/files/dalawozujir.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bf1e1ba7c---82446853983.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/1ela4jj7tl85mf2t6jut6vbkto/77195921525.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/ga90d11vmdcf4cgsd3h86e38v1/20624356928.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073397caf9d5---54521285521.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ce7c81088---55698655198.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099967a5fe57---nezetotixibegisagax.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_off00010b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B18 11384 bytes
SHA-256: e8eae8b6cc7d04f49bdd159aef3e2cfff56652e371c8f4716eef64017a2338b9
font_01_sfnt_off0001255c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255C 17644 bytes
SHA-256: 635fef28be0602089e86c9d85db09e484eea3c65e96500418dab70d0c5f15346
font_02_sfnt_off00015392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15392 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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