Malicious PDF — malware analysis report

Static analysis result for SHA-256 065ceb64837b3baf…

MALICIOUS

PDF

85.4 KB Created: 2021-08-20 10:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 719528b1508f96a8fa98a4e6267865e9 SHA-1: e15fda5aea9bc348ee669b4200f2729aa59cac01 SHA-256: 065ceb64837b3bafec63a0e4bd514ee14e21b2b565b523b33924c44ea9e0b4fd
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm with numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to host or distribute malicious files. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928dc57929a---befonuwazonutaxatujafej.pdf In PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c21f36f0e62---papuzulevo.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608208fb8fa03---7514399663.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/rufugilejiwarapebejak.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/lomesufaj.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/tajufubotozanawudu.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/28380074221.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/86783122119.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/ldlkdq1mdiir4tmftbinfvli5v/77740014450.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/10665356247.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/gibitekobanuxumowel.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb4ecce07f---nisakisuxiduxegujagatazij.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbeea0e743---35950449706.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9cf4ee01d13e268fdf5ee1132ce5bd11/7704884844.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/de22f746f4020650f14b47dc97ceaa58/28602445264.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/rorumuvugasobe.pdfIn PDF document text
    • http://www.uniformsolutionsforyou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d39ac9613c---pavavaxujufewomeruw.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/56232273131.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/34000913858.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0b88a90c7e---15489701155.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=partituras+de+saxo+alto+pdfPDF 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_off0000e7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CB 10592 bytes
SHA-256: 6a7ef20e56997d4604146411a99e45363dbae83b014ab2b98dabe2b1854c5a38
font_01_sfnt_off00010022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10022 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11834 18116 bytes
SHA-256: 4e505d840f65776adc85370f22436ecb2b8004b2d27f30e8238696d6ed7e66a5

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