Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6076d31dc874120…

MALICIOUS

PDF

72.9 KB Created: 2021-09-07 16:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0c64692bd01d7f106f675f2206780e4a SHA-1: b50cbf36956fd02f432a25ef201da13ae5336390 SHA-256: c6076d31dc8741206f76470c81a958f012408ad97260d8b95dade5d3787a6bc2
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan. The embedded URLs point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://standartbio.com/fckfiles/file/78250365952.pdf In PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0904/40b05ad5169b10b92e001b0111206b42.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606da3b857d45---sixexovidiz.pdfIn PDF document text
    • http://gyobel.itpublic/file/bunexerurekubube.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612dbb1072e83---48821077242.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/zefemidetama.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/4ec930d49433376514d0f4aaed26f9ce/60556760636.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/97711750033.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/f6e59a38b03086102d0e99174ac6649b/17492236421.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/577cc652e30e11f72d97d1abc83feb02/41198406349.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/2293275933.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/radag.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160875b2e08a07---24451935021.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/8fga1hsnn5clc3e0li70mikq16/89319405399.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/55766060807.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/96466126381.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/bb196stdo23j7d6jvr9lg3qq27/kopinene.pdfIn PDF document text
    • http://accu-chek-event.com/ckupload/files/9891323251.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ee3d0b425cc---tuxozifutunojozit.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/720989fec5b48bb5e03c917a32effb64/fibutunamabukusomidixo.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d66dfc9527---76595105921.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/d5e8qc198paqg673grk35vg14i/25679247798.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/lkbd4qd5htiiqre583eeau6165/9643714192.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=class+4+science+textbook+pdfPDF 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_off0000b95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB95D 16840 bytes
SHA-256: 5a880e54d9f08e5948e07b5dc91abcf10fb8d490797cef2bec8d9e48ec9f7fe3
font_01_sfnt_off0000e4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF6 10956 bytes
SHA-256: 91c1411e84d312dbdcd59e23cffe4db123918e829f1784bd5b0f82341163bded

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