Malicious PDF — malware analysis report

Static analysis result for SHA-256 a239c31ef5a25583…

MALICIOUS

PDF

85.8 KB Created: 2021-08-30 19:30:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 135d4ddef04852983c7a2204fd60eb90 SHA-1: 8d6b1f37450b827c30aa9fe221eaaec5c56f026d SHA-256: a239c31ef5a25583c515b5f015c31b4017cba040ba8a60f1a8bc422ef60398be
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a significant number of external links, many hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/18a3648b6043092816b96cbfe21cddd4/nolumir.pdf In PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/163b9d51e8d4eb0d4d653c7471d9319b/regekobidosujuju.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/airjc00d7hct3vh7c42icismpc/muvudupelopixuvibujipitom.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/botagijo.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/gevixodulitemopus.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/zukejijuwipuselubona.pdfIn PDF document text
    • http://learningkey.org/userfiles/kegazumudusezigodivamiwib.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/8258456134.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/95921625669.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc8483e0ef---38837151154.pdfIn PDF document text
    • http://asfalon.com/__files/file/visefibatejozuvasananu.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dpe13o6d740f6hckjk2s3ldvn5/8182347038.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/74233759664.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/01628a00d7038e322ac1a26a94fd12c6/nokofilabusugex.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/17060921403.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///monabezojisodaf.pdfIn PDF document text
    • http://petersonspann.com/clients/3/32/32c4b2f41fa698b5b938e848169c8dcb/File/74419731864.pdfIn PDF document text
    • https://altbuket.ru/files/84913579403.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733e604c3cf---50325229658.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/gagonapulufivimunewuzewu.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5ce396ab3---28317847056.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/jenumutafaxu.pdfIn PDF document text
    • http://elyriacatholic1970.com/clients/7/79/79c6984f8945646ae1b55d50a6b4dbab/File/32450701901.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b199c64fdb3---54938541897.pdfIn PDF document text
    • http://helpibr.org/clients/f/fe/feaff840d005acecac0f151e8679c8db/File/86747355399.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=2nd+book+of+old+testamentPDF 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_off0000ea28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA28 18184 bytes
SHA-256: d3f2fc746db111eb749346e02e0cd4855af5b00cd663af5fcff2f17913f1e6a6
font_01_sfnt_off000118e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E2 10576 bytes
SHA-256: cbf359aa6647b2fc4348c111bd2d2f29b1c545dc452050d4324a5f7f048defba
font_02_sfnt_off0001311a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1311A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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