Malicious PDF — malware analysis report

Static analysis result for SHA-256 67d1a862dd8ab787…

MALICIOUS

PDF

87.3 KB Created: 2021-09-13 15:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 67ecbcbc326d63f46af9fa10279ff12e SHA-1: 97d6b0cb8af5e7fbf30dba6e266df7d710ece84b SHA-256: 67d1a862dd8ab7878b3da2cfce157df4dbecfd5579928783dd1a3092e328f084
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or conduct phishing. The presence of numerous external URIs and link farm heuristics strongly indicates a malicious intent to redirect users to potentially harmful sites.

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 https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab96dc9988---tedojiz.pdf In PDF document text
    • https://tonthephunglan.vn/upload/files/javagopamewomekalabele.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/zotubasoxari.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/eitnh2pv6dpkcgvu2vt2r6j7vl/mujizugasiz.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/nularaxofotadugiwo.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161300715b0304---77453537075.pdfIn PDF document text
    • https://ntc-container.com/upload/files/wojofibopob.pdfIn PDF document text
    • http://93564497.com/userfiles/90644069234.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae52ca9ffc---54480705974.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/vadukoguzalaredajulo.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/b9feeedf472bab6555c30f28a932d96a/wawinurojibax.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/paxisej.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/64707328589.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/pikebuze.pdfIn PDF document text
    • https://j26clean.com/upload/files/gadanudax.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/59133033872.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/wikefejironul.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/b2635c2c44ac0d86f4f154038703039a/95596400728.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/widaribe.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/44122920936.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/83737833849.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/virulerazizalekigasawod.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/vepilomemi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=tabla+tuning+app+for+androidPDF 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_off0000f26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A83 10576 bytes
SHA-256: 71a8102353dcc75b60a0fcc72868dbbc2a940766b4c9a1b00fc9631cd7cf0597
font_02_sfnt_off0001223f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223F 17768 bytes
SHA-256: f956f12776edc85b657458d72a9c45908e8ea756b93335a0ab661011b678636c

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