Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0ef55880f1110d7…

MALICIOUS

PDF

87.9 KB Created: 2021-09-01 13:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b77f109d828df7b10e62730d4834f4f3 SHA-1: badf6ba5dcc4036ade0817f6b045474bd06b700c SHA-256: c0ef55880f1110d7c4625f15ae6df2589e1db722a4868d67cc344f820bd29540
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised or disposable domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings indicates a deliberate attempt to obscure the final malicious destination through a network of redirecting links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/50982c50860a2a282853abe36a7f3ffd/29188978374.pdf In PDF document text
    • http://www.520amis.com/upload/files/91492116049.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e498e2114ba---91840135123.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/98108350346.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae42d1c565---daponizolebela.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/rolesabapi.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021072923512220.pdfIn PDF document text
    • http://iphysiology.ru/upload/zabilesipub.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/67941802799.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/19862113059.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/defiratebedoruw.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/91766434231.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/desalufulafutigirutano.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55443429825.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-9/20210609003820892075.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/86805c067207e3acbb8aab398514b133/50867964570.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/11e41d3ad111758e3de4dd144086170d/55241760361.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00107d9f62---86234160334.pdfIn PDF document text
    • http://accronline.com/userfiles/file/juroba.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6a831ef42---2648787809.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/vuzaxot.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/72dd3466da4b5ad13983d5a6378b0c49/kobupipedobumubidag.pdfIn PDF document text
    • http://rotang.net/userfiles/file/94150233272.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=voila+french+meaning+in+englishPDF 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_off0000e3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E3 23576 bytes
SHA-256: e6fbbd0cd6021f54372c0c4e2ee77ecf14614562b36a94fddd17bd9535180059
font_01_sfnt_off00012104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12104 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001391b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1391B 10656 bytes
SHA-256: 879867c25a2312461199876be00fa70158cbb833b2400d97296b7c4540f05220

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