Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c2b66eb919cb301…

MALICIOUS

PDF

84.4 KB Created: 2021-07-14 10:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7429f3fee9ac612f49d3c94f124110fa SHA-1: ca2e3b60b97f846f8c5d0b286cb259907f331b7b SHA-256: 7c2b66eb919cb3017dfc7e6fef7e300e45b9fdc9e609f83dc528b34b4ab1786a
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload directories, suggesting it is designed to lure users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://leesman.com/wp-content/plugins/super-forms/uploads/php/files/f81bbddb9eb243627c3309745db4c832/vakopusuridigedesegunu.pdf In PDF document text
    • http://euro-ex.net/images/blog//file/3556326799.pdfIn PDF document text
    • http://ecotrans.vn/upload/userfiles/files/42363520245.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/04dc62ab02537d692559b8645b4ff9cd/gigoma.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/99b35e105e2a53f9971aca30de296431/gasimedimejowo.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/dff9dbabacd3d78c65b13506b232cc43/78325417728.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/51n9805krjh3sb9gj3f6bcrdrj/36102984546.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210607072604.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/9a3ba97e362d1b19ddfd6aee52050e3c/wetevarilotu.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/gozorujemisexoj.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/merogepaxasobenalapumumi.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/26724731505.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/5fkqvr5fdf8oj2vu0ka0rdirh4/kikudawisakijovofir.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff8bf6f32f---36279430150.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec31a51c4e---bekaji.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/94079809319.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/68992345223.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/1e19bc563e143c459ed9fbf32f43cd0a/palarexowofo.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/danipajiripu.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/24bd11969909ff2d99b8da84dd48aacc/pujodamikopavexata.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4265c6b33---52239654046.pdfIn PDF document text
    • http://huiking.cn/uploads/file/302207546336.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=sql+server+group+by+having+countPDF 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_off0000e4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A5 11292 bytes
SHA-256: c994238774a0abb205ec9f2191b1986ab312d2fa42b1d6a5e613f8e8e5df92dc
font_01_sfnt_off0000fe9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9E 17500 bytes
SHA-256: f5caece20ca61ae71f204612d9df9a97a740707744a45bae1445594a3a3e7235
font_02_sfnt_off00012c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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