Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdba59842c62b1c7…

MALICIOUS

PDF

92.2 KB Created: 2021-08-07 15:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 73dbcce3ef03fc27a80793f9e7a9fb81 SHA-1: 9387e51b5863310879d9b7a40244fe66c1d4bc9c SHA-256: cdba59842c62b1c74e856e465cb9a6f81a3e67fab9561b5fe11b5515b7c07eb3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classification strongly suggests maliciousness. The primary attack pattern involves luring users to external sites via a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d944b75ee8---segazi.pdf In PDF document text
    • https://anmimar.com/royal/userfiles/file/beripofaril.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbce16992e---93933801732.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/5in3cp965r4p6ng9q16ihlg4c7/juwuvoz.pdfIn PDF document text
    • http://slp61.com/clients/e/e2/e296dcecfd7d10ffef0cc83fef253c72/File/32023930085.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160771d2382f74---kenejopimari.pdfIn PDF document text
    • http://nnrhc.com/clients/9/98/980d61ede38c9a35fe3396fb65651545/File/bokirelivitixej.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/kulez.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/88679355413.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/e3615031500e9bc8ffaf5122821d4647.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/64282883065.pdfIn PDF document text
    • http://darec.sk/files/files/86981618286.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/24040731399.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160951fcd89dfa---65067397988.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/500aa5fa9fca8a881300c757b4cfd175/lezisususakokavonijize.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/detomusumoviw.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/63325986522.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/13356741784.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/54365880751.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/bumezukevi.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/p6tpf6um9b9r7fam64q905naim/19602316700.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/81533994868.pdfIn PDF document text
    • http://446888.top/userfiles/file/33614972648.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/vagariledumebepelatuvuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=fichas+de+comprension+lectora+secundaria+para+imprimirPDF 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_off0000fe7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7E 19984 bytes
SHA-256: 90abe3201723e8b2a63b4fbac3e61dcd148c9422b51004460230544261aecdfb
font_01_sfnt_off00012fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE3 10856 bytes
SHA-256: 3904a28ef24b74ea1381463ba67ac46c5c1d47bd3107f0301d2edf77b1221b7b
font_02_sfnt_off000148c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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