Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e52200ae47588d8…

MALICIOUS

PDF

131.6 KB Created: 2021-06-29 19:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d5915aadb577465a9c79e4eee4081009 SHA-1: 53d92ab1d4eae5d05e73a498d1199374a53d9479 SHA-256: 6e52200ae47588d8f18b0c1f698a0b402988d6d97661b76c294832dfecb33119
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the PDF is likely intended to redirect users to malicious content, potentially exploiting vulnerabilities or delivering further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://catamma.ru/uplcv?utm_term=top+rpg+of+all+time PDF link annotation
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4f261b84e---bipajegora.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/87442451964.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772765138a4---59332037965.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160abc5c6173fb---57365474410.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/18092544113.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/befutotilomasurepe.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd4f15635e---92129559001.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/b336935bb5e5552b48bf9af8a0433da8/75481828759.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ad3a650c3ebe5cd0d27e621257b4f8e8/1030216526.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48559913129.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/mifesexogeja.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607f77399b227---9945882412.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a69cbc5d43c---96023188788.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/71767862975.pdfIn PDF document text
    • https://faprosid.com/file/54914303840.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/208619f750ed8d2a0130aed0568774ec/11891077941.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/7d6dd60d4eb6d50cd30554fdb72339aa/41180712388.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/4a2f0e2a9a5ef9db999fb096ee84f22b/potoruvoxivovod.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/kezexaguzuwa.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160888cfad1853---27365599570.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607460f6a117a---64382177623.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/pagamikiduxisinakaka.pdfIn PDF document text
    • http://1982thsreunion.com/clients/a/a8/a85c6617a93da1462bf6c3e7dda9c043/File/13244053797.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608538ad3daa7---27880022871.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/59d6018f4f692905ba32ac2c2a3acb5a/rabilobetoxizevuk.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_off0001a232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A232 17448 bytes
SHA-256: ab9c9fa71d5e020b9f0acf03860f8fbb749b851f0e85d448d0df738a095fc2a8
font_01_sfnt_off0001cfc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CFC7 10392 bytes
SHA-256: b35623ee85d1de6471e4273432ae4a3b68425bad973b21aadf081b445197e353
font_02_sfnt_off0001e753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E753 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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