Malicious PDF — malware analysis report

Static analysis result for SHA-256 c08d05c7a668d17a…

MALICIOUS

PDF

96.2 KB Created: 2021-07-17 09:35:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c7b076d1aed03a787fd106e41e73d226 SHA-1: 1e0dc201127c4802b838bf7422783ae60c0164d8 SHA-256: c08d05c7a668d17a00dd4b7bcc5663733dca513f01b2c243b93b49ffa05b3eed
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary purpose appears to be redirecting users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae300b72b1a---zidoketevotajikom.pdf In PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d49366fa9---rozik.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094dc5d16911---60288797706.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/4f574de9201a243d6887cdf9c422d9e1/siladizugusodo.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/46809747510.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/8d2b51b96c773e59bbf8969cda490d10/82758971536.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0041915e7---38297269862.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9eccd108a5---betotexuj.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607ee3d81efac---2487256618.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/fejuxak.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/604ska0uipu15rdvlsbkn4fisc/50595939317.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade28202354---wedejotutupaka.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa62451124---3239338617.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210630192213.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/ronapesomebikap.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/95984734676.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cd2d9341098---69350802337.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a3c294a2a---xelototufo.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/3880342398.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/31ea2b0bebc8f517f0bf39e8f52b2ce1/xafatanovovuribone.pdfIn PDF document text
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/sn7n8k917bocb55auo9u9gr9t2/21286220600.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/2f5b5b019d1e4e0a5ef5adcc5abc61d6/73832177894.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a97cb56f656---paxuled.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/gotewixuvavesi.pdfIn PDF document text
    • https://groupunsur4.com/contents//files/5016902401.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=introduction+to+plants+worksheet+answer+keyPDF 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_off00011533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11533 17052 bytes
SHA-256: 00416ce1a8e4f0755481b997a59a606e6f5ec39711ae196895bee8cbaabea5b5
font_01_sfnt_off000141b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141B7 10956 bytes
SHA-256: d707f3607c963ec9eefa81be066f8fc117cf276e3a51b17fb9ec8b07e06ed74c
font_02_sfnt_off00015b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1