Malicious PDF — malware analysis report

Static analysis result for SHA-256 58cfff93329188b1…

MALICIOUS

PDF

83.6 KB Created: 2021-09-09 02:31:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8ef031213153aaf0683d04effa0e0d57 SHA-1: b20096284bf6a79579063da9ec315c5b3420ef2a SHA-256: 58cfff93329188b12803d9f80bf2a515868a19cfe80cc79bda1543d912d7f222
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm used for phishing or malware distribution. The PDF structure itself does not contain readable content, but the presence of external links and the overall detection profile strongly suggest a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/35437435569.pdf In PDF document text
    • http://erh-hu.com/userfiles/file/67613397149.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/jinasimuwat.pdfIn PDF document text
    • https://signika.pl/Upload/file/33151388559.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613935503f69c---77655688892.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613934a2e1e4d---wejovamalafaxok.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/81268677199.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/ffca0006440a583f53bddf2f5f23bd38/52989787828.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/6881363848b310758ba9a27018073a8d/sesasujazuzadapodunowetef.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/56343283582.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/4422780380.pdfIn PDF document text
    • http://punaide.com/userfiles/files/11395229913.pdfIn PDF document text
    • http://shopabrang.com/images/files/turapalasa.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-08-04-33-24-27.pdfIn PDF document text
    • https://vleek.com/uploads/files/mefin.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/75817101604.pdfIn PDF document text
    • http://prograsifkalip.com/files/zalire.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132c8878f164---73984294238.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/xerurofavadujag.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/41431437559.pdfIn PDF document text
    • http://simsoncantho.com/userfiles/file/zizemurajasawiwibujulifid.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/fazifebigomavakarogupot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=which+is+the+best+cricket+game+in+the+worldPDF 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_off0000e0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BC 17736 bytes
SHA-256: c80397a3937d420f051757b892415836804d0af25966bf5dd22068a995cb0205
font_02_sfnt_off000126ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AD 11128 bytes
SHA-256: f69ec9150e41f55fa45bc0bbdea2ddc1bde6db6183d99fad7a32fb774e45827f

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