Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c53a91b3e5b857e…

MALICIOUS

PDF

73.5 KB Created: 2021-09-12 21:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 276f278aea64395c6477499f1a76c5c1 SHA-1: 30ea52daaafea4292efc2b58a1a8c4c10573d384 SHA-256: 2c53a91b3e5b857e2575fc35ad15fbec4b88e1c048d9c5e0b0ef084d1d2284f5
176 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of PRC/3D content and duplicate object bodies are common PDF obfuscation and exploit techniques. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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://crysiq.ru/uplcv?utm_term=amazon+old+version+apk PDF link annotation
    • http://sartor.ru/upload/files/64548692947.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/78433450751.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109101356163556.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/84058793847.pdfIn PDF document text
    • https://emprenderem.cl/files/fitemowowow.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/161330612bf9db---35015567575.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/25533989752.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/tojidinamuruma.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/24400750691.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613532f971113---zemedobokonobote.pdfIn PDF document text
    • http://fivelscope.net/fckimages/56466681384.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/20873318541.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/ritebufedifemonala.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342d5a00d98---2772136117.pdfIn PDF document text
    • https://scalping.ir/data/files/file/30773778317.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/zigifugisufagose.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee9c000458---lavixoweluvovisinabuvab.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/duvijanosaromikisisi.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/fojilenasofuvuzetojapu.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/42283000992.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/2514614207.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/09/20210902062155.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e99dc3a9d2---91826834733.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_off0000bd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD5A 16620 bytes
SHA-256: aa8f3994fdd0b82770b31ed50cd8740d8635f94d1c707ef4a3870ee04da7c558
font_01_sfnt_off0000e855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE855 10652 bytes
SHA-256: e87662fded173bea06324fecf8027f24b3f54764ad7edec752de023b2472b0f9
font_02_sfnt_off000100b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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