Malicious PDF — malware analysis report

Static analysis result for SHA-256 023318c2b68e500c…

MALICIOUS

PDF

141.1 KB Created: 2021-06-27 01:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 48a6ac6ad4ce7d98e2ed3d6f8bc90418 SHA-1: 91c55f2d48339db3486dea5cb20c286781d382fc SHA-256: 023318c2b68e500c6633e89bdf8ae6007ea0e94812d3a253c2979941dcfebe19
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for delivering malicious content. The document also functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9708

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=how+not+to+summon+a+demon+lord+1 PDF link annotation
    • https://studiopros.com/userfiles/file/In PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/77026559728.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/21208545716.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/da9uccbdfgbsrfh8jn2b0vof77/23979101059.pdfIn PDF document text
    • http://nfc.soo.jp/file/13091094147.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16096756dc370a---botabututeru.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/714gh2i63b7t9bjnltfq38a13n/gefali.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/1f269577386c335aef38b5adc48ef24c/99713644533.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/0e9d1e458c4270c80a8f72f216b961de/95553184030.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/8a2e0dc70d70b5e6d50795535032cfc7/nukovagisitonavufovide.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/mujasudagerobamofepowek.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/mababigajojo.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/66807d1a6599098cc2d8700d917d0d8b/tirozusilumutopupulanuzat.pdfIn PDF document text
    • http://lowchens.org/userfiles/file/zukupojelakadawanavupu.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d2b2a0e62---nijonamiweru.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ea06c5b49---37514775135.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/43124288760.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/zuziparesusalutoti.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/114p0oftk2p7kh80l9lskek55h/gejosileregukewa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f36020ec1b---7469630692.pdfIn PDF document text
    • http://rilta.net/userfiles/files/pepopakimofora.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/28279465120.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f0b8f207f---71721997332.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c40d643d509---kopojusisimigeze.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CA2 18564 bytes
SHA-256: 18ca638f09956f614581949b046fc28ed8129f12b1c39a73071aa5a4d6fac453
font_01_sfnt_off0001acca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ACCA 10548 bytes
SHA-256: 843660efb0010dc4421e77da6ff164c042e4f18f8d5b192d926a7e3d2c26bd0f
font_02_sfnt_off0001c4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C4EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001dcf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DCF9 25512 bytes
SHA-256: 41e03ffa0f22e8238be5c8c21adbf4cfc0fc2c314212603283f892e64414e40b

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