Malicious PDF — malware analysis report

Static analysis result for SHA-256 97c41af52e0752bd…

MALICIOUS

PDF

82.7 KB Created: 2021-06-29 16:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 79fd2641a0a4aaf3b36abaef9b4f4624 SHA-1: e541df7bad8e8cc9808255fc378c858c6429c789 SHA-256: 97c41af52e0752bd62a3919cb10a8d18ba4cf6634bcaceb549c531324efa5b21
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs hosted on compromised CMS uploads and disposable domains. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/b6ba25767670e9c30dd4b611fc583185/mularikodo.pdf
    • http://xiaohecollege.com/d/files/furosa.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e61a9ce6bc---ratifef.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1f96e17c6---lusoz.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ead1be43b5---42344936621.pdf
    • http://aivieksteslaivas.lv/userfiles/file/tonasamowafisoxa.pdf
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/cfb2251564d7c22f29d6650bc465f6dd/53287983759.pdf
    • http://ahcxdq.com/uploads/file/231004422217.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/5d24a1cb368ae06b190416925967a97d/mokewitonesefofakorug.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/96ece9d25407c15dec76ecd913a8747a/927417122.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160d70731241ab---nadukas.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/q9ht39gn0t5o8nasgv22l16q0j/gadajoporamojeniwe.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/37pbh7l7kqkl1r0uan39n70m0k/likatefefo.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/578a797b1ef9e442f529d3701c84201b/13922362306.pdf
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4e86a7a54---vapokeku.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/962b7ebff6e35bd15bda658921256074/27338517526.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075895a46fe7---suwemiferosuk.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=hydrocortisone+for+shingles
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e136.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE136 16792 bytes
font_01_sfnt_off0000f948.bin
2552345defbdc102ab7f30ef2fe1283303963dd98b990e0370ebb741aaf2adf8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF948 16544 bytes
font_02_sfnt_off00012453.bin
4f4c040a5d9834ac21833cfeae679332cfda5219c7f55ba423eaf04c7f861ce1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12453 10696 bytes

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