Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3cec90cb54e2b32…

MALICIOUS

PDF

81.5 KB Created: 2021-09-01 05:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 15be1e60ec81cc905c9a45c8a5b8095d SHA-1: 0f53d38ea16ab0a30406bf282d8a09bf71015a7a SHA-256: c3cec90cb54e2b3215549cf05f617432d0b483c4a6f9b2a6aa1248069c8d2a9d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to various domains, some of which are hosted on compromised CMS upload storage. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links suggests an attempt to redirect the user to malicious content.

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://cyklo-wellness-penzion-palice.cz/content/foburoruxavujabixuzo.pdf In PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/kugomu.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb0bd06e7c---76641339799.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/99745074966.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-07-23-11-08-07-8xMFhkDk.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d61673759---zejofipajujabokadoduduv.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/b1bi1rpi90cn3h1i0hl3qcgu5t/wudizadoweju.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/12cf7bdaf990e106b774a6a9f2accadb/pomipuwikanebegamugo.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8496a907e0---60189050451.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/kemopubuwitozokixa.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/gofitelenul.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/44984029735.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/jevivedisonujavoxefix.pdfIn PDF document text
    • https://lemonsport.sk/upload/file/29570693841.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/lmk6b90pn2cu4e2t29chnrl0o1/15065292667.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/7574179079.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/86136978026.pdfIn PDF document text
    • http://emannsltd.com/userfiles/supitewipuwero.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/87595518477.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/170090788460b0a8a86c8e6.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/2134918667.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=for+adults+only+crossword+cluePDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/funepe.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/6fe7e4ea2474b16a57527b49fc57c2cd/totemigaregab.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_off0000da23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA23 10548 bytes
SHA-256: 55bc3ae2315fa4a7c44e5751eade9a4ac054622fcdd4e298d2d55b1870c50c4f
font_01_sfnt_off0000f26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26D 17536 bytes
SHA-256: 6d2a3355b431f1487bc85a56ebbab6be5d94c1e3a28d77db0bf8ce4b17fc99ce
font_02_sfnt_off00011fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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