Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e427cabc9dfa6c…

MALICIOUS

PDF

79.8 KB Created: 2021-09-13 00:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e65e277c8964c5407ebe907a0c4be2ed SHA-1: 109f5f86a9ecf30f87360ee08d5509536c8cc869 SHA-256: 88e427cabc9dfa6c0a7010e00682136bbb514c858947c0a2490d5cb6ba9ad2d3
184 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains embedded JavaScript and numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of embedded JavaScript points to its use in exploiting PDF vulnerabilities for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pixomot.ru/uplcv?utm_term=delivery+from+the+pain+mod+apk PDF link annotation
    • http://acrclubinversores.com/files/galeria/files/nuzuwa.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/silosisugot.pdfIn PDF document text
    • https://wroclaw-effatha.pl/grafiki/file/disejibalaliragesuki.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/suruligaf.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613535aee18a9---49616343515.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138e027bb5b1---fejomenidora.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/75489690965.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/duxopodomowokivetilu.pdfIn PDF document text
    • http://sdes.in/uploads/46061431886.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/24882872294.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/mepurufeterixexukefawezan.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/wepoparuxavinofetapojipu.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/2760366367.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/nakuxunulon.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1315ec201---10337202422.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/kofilibadotixalok.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/dogiviwagirazij.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/90672619605.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/junaditukinorolofifumuluz.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/wegebizagofat.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/vosiwepeg.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/letisazepuni.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/zarijivatokojatutaxel.pdfIn PDF document text
    • https://expomediainc.com/upload/file/nofegozigefika.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/73155102997.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_off0000d48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48F 10868 bytes
SHA-256: f1442e840c66e72c8e4788b66d92764404b63fe942c2daad005e82e8e662d46a
font_01_sfnt_off0000ed76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED76 17276 bytes
SHA-256: f531b4807a678ed18f65172ddb340308d48be4f416abdd20a4dbef6ca84e2657
font_02_sfnt_off000119ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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