Malicious PDF — malware analysis report

Static analysis result for SHA-256 c776db54f5f7f558…

MALICIOUS

PDF

89.4 KB Created: 2021-07-05 03:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c460430761c7720152ef85bf5d81271e SHA-1: 600ce87e1c11bcd0af5b8510949407b34d478b18 SHA-256: c776db54f5f7f558b44c0482c895d7e5033287c571a0d975201c2a5b7cbd61f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. The file's structure and the nature of the URLs align with common tactics for distributing malicious payloads or conducting phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/7d838e98d3ab5d92ad46fcacf99aa304/rupadulunanuketowus.pdf In PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/dakdevbibdmvv3cgqduhpif0fe/19043497030.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/48956906986.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/9t7apj9fdnrn8av1fjnuheag13/nupip.pdfIn PDF document text
    • https://miruyuta96.ru/admin/ckfinder/userfiles/files/nolategonatifilalofufawu.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b131bac5bda---kaxuxeva.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/3gdu0s5lukupqo78ofp6fia1q1/41978607680.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/66676212098.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8d6e33d0e---55284190609.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/6e2902ef774747134e9b046b2fac0ce4/gutejut.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/52669102941.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4023e9c99---jalamufuf.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e6460677d---98354722425.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/26f0c91915428ebfa5a6334db34bd1aa/23466870402.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/tawaw.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2abcb700f---jufoduzeremop.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d45a417130c---85761854867.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/29246320426.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/solesuworijomumi.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/5cd8aa1a7ad8c8ab06f37c8cca4026e9/40682596174.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/bd8e525e37prk6cu1nl70t11ds/nozilenalakolexabesixo.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/vnm4olg6trdptsmge1o8tl0h55/kodepomurapereja.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/laxuladixa.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/dofir.pdfIn PDF document text
    • https://krossi.ru/images/content/files/vogeluwukuk.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/637c22af99564f26975ac0651152aac2/54358134104.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=rotational+dynamics+examplesPDF 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_off0000f841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF841 10836 bytes
SHA-256: 4c12a7b54db41251e99fc3fac3e6dbe17fa7d0787ecc7ee7968b2c609597ed11
font_01_sfnt_off0001114b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114B 17632 bytes
SHA-256: e7e46e66fd62eaab811ea71255dce60eea43e3678cb123780bb8de0a306d6520
font_02_sfnt_off0001400f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1400F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1