Malicious PDF — malware analysis report

Static analysis result for SHA-256 28450ef00aeef7a2…

MALICIOUS

PDF

102.0 KB Created: 2021-07-04 02:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 516afb9086922a59e9b3f9acd157796d SHA-1: b7f40cfde38ffa8c913bda42c82e4918d83fc5d5 SHA-256: 28450ef00aeef7a2d30633d67115358a29f29334c3896cbb31f93af493219045
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or downloader attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9767

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://ajisushionline.com/uploads/files/82893781298.pdf In PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/fgm0iglhfo90rqb12p5rr0qbfs/22810867768.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/bd37rutr7c44d56ddeepiu7cu0/saged.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/06/30/73663609941.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/78735492736.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/170f104b6dda121d73988e3375a3c1f5/60820515869.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/26940949363.pdfIn PDF document text
    • http://merwepizza.com/upload/file/zemuwedomupelapagosulok.pdfIn PDF document text
    • https://ewt.cz/res/file/23232821427.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/52769926071.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/murazeragutepotelovipafu.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608cabf3316fb---22830640794.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/a45c7987eb966a7e80b68d1fc0499295/27207192728.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed92d42f35---28536838422.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/52925098246.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/2rai18oq9ijpdcvrm5cbtv55vv/juponavejunuzigetemubeges.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/mkpms8t7qsekvtbenf0ce574c4/19530245032.pdfIn PDF document text
    • http://cfacgroup.com/uploads/FCK_files/file/84757195855.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16070d3213262f---nutave.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/60fc49659d8f6c505b432bb7c0eac812/65216130699.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/ftbjl358tnarv0u199nt1i1ls8/81832364243.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/didufojowe.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/91643490948.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/10d3bd3492ca41d764fa1842331fe9e0/mejetetujesusezuxoronoluk.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/3e68b8c62db8ff98e3ed2e0324da7160/8361204810.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=ave+player+pro+apkPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F39 2184 bytes
SHA-256: d418a8bb7dbf0cfac10677c5aca7ccc84e05a5ddb7c84723894d56c22e915c9a
font_02_sfnt_off000118ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EC 16500 bytes
SHA-256: 624574df8da440fb700410ca5dc65298520bb8cbaa6a8450a33c036b71ee903b
font_03_sfnt_off0001300c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1300C 10036 bytes
SHA-256: 3fa3d5e96e64f25e8b8911be0f751871fb60e205a4752332a146b5de006bddc7
font_04_sfnt_off00014683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14683 31372 bytes
SHA-256: 444e73539208bf27de5f4fb5eef695e481524f97292a2ecb1845df8cab4bdd8c

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