Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb149ed3b6d4f5d…

MALICIOUS

PDF

80.0 KB Created: 2021-09-04 11:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 33d23086010b18f1e6a2973900446f3b SHA-1: ca393aadf687460f08f713a0857a9654e10e59f6 SHA-256: ecb149ed3b6d4f5d091b3f9824f5501b145d7123f29ca47f54b08adf271cbbe7
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including a critical finding for requesting recovery secrets. The document's structure and embedded URLs suggest it is part of a phishing campaign designed to harvest sensitive information like private keys or backup codes. While no scripts were explicitly extracted, the presence of numerous external links, some pointing to compromised CMS uploads, indicates a potential for further malicious activity or redirection to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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 http://velocimapper.com//webfiles/file/83108716662.pdf In PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/0bac9109e5d0b8247b687a09825b9d12/50367104793.pdfIn PDF document text
    • http://tiquital.com/documentos/file/gitep.pdfIn PDF document text
    • http://www.toptehnik.si/images/befege.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/l0h35qgt333bbj53takl53q71e/81737059645.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/202193121424444.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/belip.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/putisubarekotime.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/64057235233.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/gasakumawijuraputu.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160847a6b68a21---82881261594.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/17647033096.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/xixamixenenixujit.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/18789936328.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/feehp7beir15dcfl7q8ee9veh6/xakox.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/b596d8b47e8820f978d7f0e05ac27003/nesosu.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/d8af1f5df6c7240fa9e083646fd7f8a3/suropabobelafi.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/42364611317.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/7b86e8fabba3f47f26dc279869fff721/61903147550.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb508f18a22---85617659938.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/jekumakefek.pdfIn PDF document text
    • http://ducnhua.com/upload/files/watejejuwilu.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/ponaxova.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/5fa3e40bc2321298b664b9bb3b4eeb2b/22879280242.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/20038393063.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=pdf+decrypter+download+freePDF 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_off0000d4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED05 10556 bytes
SHA-256: 52006c3b97b1261a2fc7197e54a17fd03e4e9b53628f731983cac0dd4d9f279d
font_02_sfnt_off0001054b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054B 17280 bytes
SHA-256: 43da446c79530278f085f4d64829ea15511061db9fa9cb6f502eb32299053f47

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