Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0314628287261cf…

MALICIOUS

PDF

71.1 KB Created: 2021-09-25 15:33:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 79718cdf51cb77e1b2d6d82f0841c1eb SHA-1: 517b3257deb2232adb8becbf384e242e3995a3dd SHA-256: b0314628287261cf3ab283215bdd6b790ff70125082939954cec31a02456340e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities and redirecting users. The heuristics indicate a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • 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.
  • 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 http://cavusofis.com/images_upload/files/besasogolunizebolotenu.pdf In PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/mp7h61pferisqe18bucovsb9n6/vesasenaxabavunope.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/17387357288.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/14882283560.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/kokunixamekiko.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/97775065971.pdfIn PDF document text
    • http://machulski.com/public/file/88506414846.pdfIn PDF document text
    • http://dakmet.pl/upload/48520279260.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/96026234009.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/p31lhnsc2gnkvp459oh37ogqkd/getipimewavaxi.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/potebifemebadudixaze.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/tupodamututiludoj.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b692278d71---52924564254.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/fupoxoxa.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/tagagikaligosulubitineno.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143386927119---46046988731.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/rumopomejoroberadi.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/dorojojepe.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/posipedovosajoke.pdfIn PDF document text
    • https://nppgursaraijhansi.in/ckfinder/userfiles/files/wapuxilezona.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/senunesakuz.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342239a9cfb---poletixupegukedo.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/36379114150.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/58051574192.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/jotijorulipaloj.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/zikiridotugitesubise.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=android+string+equals+not+workingPDF 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_off0000b579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB579 15172 bytes
SHA-256: 07f2336ca6ccc2842fd28ca2f9505661bdf496f4c3ed8a41cdd5836b112f6256
font_01_sfnt_off0000dc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF419 10828 bytes
SHA-256: d52013685e6a32f8d085ba3b2a6cf67b632ba17671cc36ae20e116f25784ea08

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