Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d72bb30f8e98738…

MALICIOUS

PDF

79.3 KB Created: 2021-09-17 05:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9b263bfabf1e7476274042b4b0e44e88 SHA-1: 4c6e91a9ac75d8dfb44629441b340fe60b6ce9fc SHA-256: 8d72bb30f8e98738f9e57e538a77beea9e1c738d1f06f1525054d522fc334fac
204 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and multiple external links, many pointing to compromised websites or disposable hosting. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to copy and paste content into a shell, a common tactic for executing malicious commands. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=tubemate+app+ios PDF link annotation
    • http://traslochimontalto.it/userfiles/files/92854853673.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/xixunigugetapi.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/b02dfc536c4da724f2446829caea18a8/74040554975.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/93350236e504444b1332a3b6497485bf/welepewapuzagetixavugur.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090601523892.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/9531821294.pdfIn PDF document text
    • https://glozor.com/userfiles/file/76625527023.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/xosukevopewirawuwife.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/66349925851.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/tamiwigogidakuwu.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/31536683454.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/xuzexi.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/03e87c74cbe125a2be113771cb9bedae/pizux.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/difimoveb.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/ruvarowuxud.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/vunomiz.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/3791971213.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/vajiwavos.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/47726031745.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138d2a830650---riliv.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/novojadufuziwilamigu.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/10637642880.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/latisazidasipano.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_off0000d43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43A 17276 bytes
SHA-256: bedc3c6d6f7d421eb2181426f1cfe7bd95452056f7367903c4a7168ad144bfdc
font_01_sfnt_off000100d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EF 10364 bytes
SHA-256: 0c9a6fd59a3767594570ad161ff233661ce08af0567d3ea3fe4602dd500ed4b4

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