Malicious PDF — malware analysis report

Static analysis result for SHA-256 5683ead37706e6dd…

MALICIOUS

PDF

205.6 KB Created: 2021-06-24 04:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 4987436483ebd48ba15fb295fa6711e1 SHA-1: 6aa5394d9cc6cc53e8341cca216bf5d81f71a704 SHA-256: 5683ead37706e6ddfa02d88e6d9f088f4682d59fd9ec61344d791f62b29e2c1f
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. The embedded JavaScript and links to compromised WordPress upload storage suggest the document is designed to trick users into downloading a secondary payload. The presence of a visual download button further supports a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/ebe68c4a3077361cefe5e6fef84a9f57/48325383916.pdf In PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607770f213f18---tewenomogadesapepa.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/70f7fb9a8d3c3de6e5d12a0587af7459/nulabojebobimedunijonaz.pdfIn PDF document text
    • http://omg.su/upload/File/68473779603.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/jezuvasajo.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9bcb3938c---36981752900.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/zutabatu.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/fifufusisulepe.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16097e4d63068c---8187266145.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d803a7c215---57830679145.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/17308072787.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160826ef2eac5c---21328558548.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609956d25d475---50530562805.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/kut0vo7tao9lrd6bncnmm6mmcg/gebex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=kaushan+script+font+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://scripts.sil.org/OFLIn 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_off0002d39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D39F 5104 bytes
SHA-256: 7694cf9e2a21bb4899e9a143443953cbc68a509203c0d7b4a391fba411e1babb
font_01_sfnt_off0002e4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E4FA 13580 bytes
SHA-256: 2b89a90ed5ac8e51f1c25acf295a5aac514f33002e8cc46e82ce6c1c5aebbb6f
font_02_sfnt_off00031125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31125 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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