Malicious PDF — malware analysis report

Static analysis result for SHA-256 55b7bd7af8f87eab…

MALICIOUS

PDF

84.2 KB Created: 2021-09-17 07:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3737cba388e66cca181d46aa569876c1 SHA-1: f1d3227b940d845c453f018ee4691d141dc6e44a SHA-256: 55b7bd7af8f87eab4e1ad7a87874d39abd6e7fdd22d021f611e1fc8a7bfb55a7
172 Risk Score

Malware Insights

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

The sample is a PDF document containing embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, directing users to multiple distinct hosts, some of which appear to be compromised WordPress sites. The embedded JavaScript likely facilitates the redirection or exploits a vulnerability to execute further malicious code. The presence of urgency lures suggests a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://materialdeestudo.top/userfiles/files/7613673348.pdf In PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff747d364f---pikuzuxulobasajatesujusoj.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/1614765825f325ca8f3054f6196344c2/zasibedabelijari.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/pibatofefopivinelo.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/jirotufekizinakikevezavu.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/e32a85b38777b45d2325ae987d741c9a/lufuje.pdfIn PDF document text
    • https://dom-titan.rs/files/93173320976.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/37995196561.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/nubusuw.pdfIn PDF document text
    • http://kelvista.lt/images/files/30509249726.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eacfd87489---10738345792.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/44728750374.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/dozufijuvejutepudujitox.pdfIn PDF document text
    • http://professionalcatererspaul.pageindia.com/resume/cms_files/files/28823558984.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161321c9d8dbbf---teroxiniwitugevaraw.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139269803c19---24490636330.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/gisawunenuxime.pdfIn PDF document text
    • http://hospitalityroyal.com/upload_files/file/jenamojugopuzupitov.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/dopezekuwamo.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/17485352236.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/zapewelab.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/36pjseqj7ir575ovknslo5tum1/punajazuduparor.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/gifugedubureruxobo.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613096e3af3b4---3072056019.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=antivirus+and+mobile+security+apkPDF 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_off0000dc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8D 11168 bytes
SHA-256: 17cf5732bd4bf9059fee6ca4f57bc5f7128d110ce120f7241e5b7d6d58fe8080
font_01_sfnt_off0000f685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF685 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E97 19844 bytes
SHA-256: 788bf981ed9fe454a1b3686c1d1e4c424d3a06605035ef815a9edaacdd0572cf

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