Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ae253f20a5bb12…

MALICIOUS

PDF

77.7 KB Created: 2021-09-07 14:22:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 89b6cbc958aa61ee91a5052e536c00b4 SHA-1: 88890f07ff0d8a96313f0b8893f6a2a3c4f4a9d8 SHA-256: a9ae253f20a5bb12e299b0fd392507fb47eff2c07f562b5e4d1730d5d3e41378
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common tactic for distributing malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and URL patterns suggest it is designed to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160877edca93dc---xufenumoraxefupewejumu.pdf In PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab82a4f7f2---lorejabopizotabaf.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/493470986f8d7b768a5840d01d7c7a34/22234636118.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/65260297445.pdfIn PDF document text
    • https://ccskin.com/geektic/files/75552903607.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/33248186989.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/waminuxudufutivesowisufo.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2b76084db---36581685958.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/4639342031.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/9815155740.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/maramedeno.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/wakulanerojiriduwi.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/73777167495.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2b9a3af895106756b929b63d71d5746b/83578902121.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/2bfcef1ed32707a5d7b564112d1f9316/luvadurimotibem.pdfIn PDF document text
    • http://calhi1977.com/clients/879053/File/jorutogaruti.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/46267018256.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de875091f7---zowizase.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/69745015231.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8a296db75---88856568803.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/21051001582927272006ef2c.pdfIn PDF document text
    • https://tekmaker.com/upload/files/vibuwokemufurinamuze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=pdf+to+word+doc+converterPDF 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_off0000cc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC48 17784 bytes
SHA-256: 862fdf712e843f1cd478c21c58afacc2af320cc03712f1303ca35fad8b108e8c
font_01_sfnt_off0000fa72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11289 10152 bytes
SHA-256: ddaa40ea275b96377f026384fff091990414a64a6184288b1efc5a2f771c0f9e

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