Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1ec64b4762d08bb…

MALICIOUS

PDF

74.8 KB Created: 2021-09-06 16:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 758dc82a9bb51a13eee54e439916b596 SHA-1: f2c10b1581aa4c78c8b4f04322bfca268135d937 SHA-256: c1ec64b4762d08bbb29e3207b8bcf4a651b5563921a6ac8cf81f2a101d487aa6
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites hosting other PDF files. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute further malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://vaitinhdien.com/app/webroot/upload/files/lolariwisarage.pdf In PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c317232e4c---midawodonilobomabosin.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/4hbpt98o6tenq22mm4gqljedrm/78712314867.pdfIn PDF document text
    • http://sbairs.com/datas/files/zoliliralarasozetomupu.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6180ede96b---talegakusokozavemure.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609df3b85ac04---debejoziw.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3ca31cc0f---27790092092.pdfIn PDF document text
    • http://eternalcycle.com/FCKFiles/file/wifakepopu.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b985c0eac42---wuramofepilokivadusod.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/69607590194.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/zajegupusivejuladaj.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/6it9eujephqjcla30ncr0l5il7/48489524024.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e49662799---vogopadafujufurozeto.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f5052fa0b---45314993959.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/4tolvshruavccvor0miji16550/92922085063.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/14008913126.pdfIn PDF document text
    • https://ka-base.no/images_students/files/xupagugeloronokesi.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/22400549383.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/vodebofefeganinajit.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2421c21728---mopakinonifas.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/e5438afe394740dc9d8bd30dc77f7be8/dibakosix.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/wilipitewusoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=neoplastic+disease+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_off0000bf40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF40 10388 bytes
SHA-256: a4555f8371826fe75cffd7d1d4f4906d79274c90069edabab4fcf456c4714115
font_01_sfnt_off0000d6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF7 18288 bytes
SHA-256: 7e716633e47bbe5d27c83beed8625e5ae96906f05a88883adcd8d43a3ce46023

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