Malicious PDF — malware analysis report

Static analysis result for SHA-256 48a38388e1a39d3d…

MALICIOUS

PDF

81.0 KB Created: 2021-09-06 22:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 18115ed8c7d418f12823409077889b7d SHA-1: acbd858347179714e231e36cf60d910dbb0dbeae SHA-256: 48a38388e1a39d3d83f81119a70c30d15d8caeb1d79c5d13c1fdcf0f59099d56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to compromised WordPress uploads and disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the nature of the link farm and the ClamAV detection strongly indicate an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=mazda+3+hatchback+2010+manual PDF link annotation
    • http://cnwt.mgo.cool/upfile/files/2021/08/22/rosumakuxan.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/mapikefomajoxibofutexog.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/tvtl0obov19iv1ol6vvebrokj5/gipenovolarewon.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ba9c3a1d3d---77164789065.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/f3cba0a4295c7b0c15ab701026f3597f/67072127733.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/jezugarazelide.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/tebitoxar.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/danifiwozar.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611694a359430---gisuxafumebureselu.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072ef45b928c---31591763556.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/fawadukuxejegajogexo.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/wimubuzanobija.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/26118054252.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607262bfbe833---wujezafabamos.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/dofulunurulazupos.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/93902152181.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088980567bca---rasidatu.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/11077115664.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/niv56cnbudlamg2gu72m6f9d9t/junep.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/j189t5npup7mso3sr8lbrn7aap/ziketewenojo.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160827cc14289b---64206264502.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/e8559fa82f42048622b31caec270b910/relifunumewomapaxegemuje.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081cf69c043b---27116765480.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/f88436a23f517a3ebab58db50b2dd637/50396142590.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_off0000d6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D3 17936 bytes
SHA-256: c76fee45b45d7b954da4dd32f212d9b46bb2fd3ccec3ef07efb1a37176165176
font_01_sfnt_off0001056a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056A 10872 bytes
SHA-256: 937c6dafc6707cb7001593ba45e3717372d5ade339a7cae1689d60b6a158727a
font_02_sfnt_off00011e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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