Malicious PDF — malware analysis report

Static analysis result for SHA-256 20a5c7bf87f0e368…

MALICIOUS

PDF

85.2 KB Created: 2021-07-08 08:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7ce4b39600e02bcc5cd4538051fe4bcb SHA-1: 58f3950f112a8c5a16685c77b56ada74cff4f26a SHA-256: 20a5c7bf87f0e368e6427dbbfbd06ee8edf6dbcc7fea64c52b739d51d1f33e37
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous URLs, many pointing to compromised WordPress installations or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms indicates an attempt to lure users to malicious sites, likely for phishing or to download further malware.

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://ketchas.ru/uplcv?utm_term=he+is+jealous+for+me+bible+verse PDF link annotation
    • http://ongnuocdenhat.com/upload/files/lulipinawo.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797f86d6ed3---49145563835.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/wudofuvogonisejuleku.pdfIn PDF document text
    • http://debden.org/userfiles/file/67465582594.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/ibri7lrc4hrf7safn4ldvt3bg1/xudolidujemupo.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/99069511534.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b4fa1c50f3e---wimurofoxetagizak.pdfIn PDF document text
    • https://506hlapeta.com/files/file/tilov.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/o2hhdf8gugvqm1vcmqka7t4h5o/fewugasaxoroxoxeguk.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/c374d04dc73d756f274b757a244f4aaf/tuvavazotane.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/91941309593.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/544c3510ef47d1ff2b192fb57c1de209/mavefebulapizupoluruxivo.pdfIn PDF document text
    • https://mmszke.hu/files/file/97154708422.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9438040595---worutumokudusug.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c89d9407436---sidipamopab.pdfIn PDF document text
    • https://sayurmateng.com/contents//files/3060267164.pdfIn PDF document text
    • https://kawanmto.info/contents//files/2947713571.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a511ecc8a8---94351187074.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086acffabc3e---kidurukixinusamigani.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/u24ef41a649qv21fuuhgfoqao5/1163189847.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/fenokejulesonoduvi.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e07d7a68a81e58ceb91cbc1f21293565/raxewiwidizedeku.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_off0000eb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10335 16944 bytes
SHA-256: 8b8ab09a54896c9c12da33af2cb2ca30be3e2dea27feb57384d1ff34bb35a724
font_02_sfnt_off00012f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5B 10600 bytes
SHA-256: 059feed9e07d98bebd19cb5d25806c76b3e3a7bd3a6c7b4fb934ddfc5a7e9468

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