Malicious PDF — malware analysis report

Static analysis result for SHA-256 66f40523d400969c…

MALICIOUS

PDF

96.8 KB Created: 2021-07-25 10:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7e25ca0e9f0b54c40db663f817230482 SHA-1: 0dd028f7aa1f95df2ef1cb4b7766bb4ba279f51a SHA-256: 66f40523d400969ca28c28ef0ea77254785617d5c7c64853a4e31144370a979e
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. ClamAV detected this file as 'Pdf.Phishing.Trojan', and the ML classifier also flagged it as malicious. The embedded URLs are designed to lure users to external sites, likely to download further malicious content or steal credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9855

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://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/25db91c2176bef52c5af9614e607fa1e/kovirixufigaruge.pdf In PDF document text
    • http://summithigh49.com/clients/3/33/3334069ac8a672cbece4a9536eb221cc/File/bogijonifumopaxes.pdfIn PDF document text
    • http://pandoreunion.com/clients/81456/File/nabubutitemeve.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/40cfa3921ca8ad7eb12b0d6407de86d7/metikawajomulovogas.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/nezobo.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/ssv76tqqf4qkh8ooavir62mca0/53495462075.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a528e994fff---21517096413.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160f601e9e31be---13476380907.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/25355296774.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/06793a215ebd34de3dcc0c548e3da3c3/81613514404.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a02640d73fe---35896940394.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/omb424ch3m22mad7tvn9nh6cmq/paxifegomaf.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8c5679ed7---mitojaxifakox.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a039a4156---49908144320.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076068a279d8---nojokawu.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/pebatenojutexupinitaza.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd8f134862---bupimamimopokapat.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/28700968318.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/kifes.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/prakejbvnd9vf70i4ofpstp4bt/50002945203.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c7aa363da65---41436389362.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/bigomeviwuto.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608303a82951b---tabulif.pdfIn PDF document text
    • https://coluer.ir/documents/file/51534371381.pdfIn PDF document text
    • https://vientangluc.com/upload/files/63758570853.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/d3c1efb5121df2fe339953f9f2b6bffa/42595291197.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/vumetexoked.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/59704833792.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=write+down+the+empirical+relationship+among+mean+median+and+modePDF 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_off00011000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11000 18684 bytes
SHA-256: 373f54fa7613ac7782b251e5e9f5cc56783543f323aa70fd8a6928817b6fbe82
font_01_sfnt_off000141ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141CE 11040 bytes
SHA-256: 4c0fd461cb8a5c22e05e3472bebbec437d18c408216b2415c69811232e91ca37
font_02_sfnt_off00015b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.