Malicious PDF — malware analysis report

Static analysis result for SHA-256 0952a1125ef84caa…

MALICIOUS

PDF

88.0 KB Created: 2021-09-17 23:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 85a50c9d0abd852a4d771cb20d833040 SHA-1: 15f7d7a5b8ee180af7bd9f01171e3049c83a1321 SHA-256: 0952a1125ef84caa08f36432fea31b85ee86d5f2a15c5e67e2e80b2f705f9b70
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. It contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a phishing or malware distribution lure. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://crewmak.ru/uplcv?utm_term=record+audio+from+video+android PDF link annotation
    • http://computerdoki.hu/user/file/zurovixuko.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/tekub.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16130c9fadd25b---waxubesemipibax.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/83753072848.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/27193465346.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/48391222011.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/xisedame.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/worisalaguxeper.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/bogodetizejidiruporok.pdfIn PDF document text
    • http://keitbg.com/images/files/demotofipomu.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210903170710.pdfIn PDF document text
    • http://egitara.com/upfiles/files/jisudubibapeganiv.pdfIn PDF document text
    • http://home-plast.ru/foto/files/97907689129.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f0fb90cff---xujen.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed79969659---96198396542.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/togazalisolabo.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/aa24577ff3d815edcb972d6c24ba9198/44943042944.pdfIn PDF document text
    • http://skolky.info/foto/images/file/dazim.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/lerelanifexumej.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/nonop.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/d0pr2fi4im8iqnq0l6fr02v3p7/81908310536.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210916_235304.pdfIn PDF document text
    • http://s250801404.onlinehome.fr/img/uploaded/file/13923310377.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_off0000f118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF118 10536 bytes
SHA-256: 72f4c673961862e940ef4fdd237cf3b3af04960e547311bf765084b9184e8470
font_01_sfnt_off00010914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10914 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12126 18524 bytes
SHA-256: 79f713501d020d5e3dc0289c345f716945c034c8ea7873ea1492286a97398d69

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