Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cba8f6bbd722fdd…

MALICIOUS

PDF

85.8 KB Created: 2021-09-19 12:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ab8d08028504c8f2f7755f1f578cc83a SHA-1: ce1e4574d7bda88ac24cdce9a1d3ea5ab7d8dee4 SHA-256: 9cba8f6bbd722fdd1ff298ab958cc0d60e9f0687fcfe3cccf9ea78789dd0a5ef
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to files hosted on compromised CMS platforms or disposable domains, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a phishing lure designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://paulogomeslda.com/userfiles/file/rutomufowafukawalan.pdf In PDF document text
    • https://florissantdesign.nl/docs/Image/file/lanipepiv.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/4782604275.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/tugopoki.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/79334683218.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/49355020152.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161441259d90fb---64227214336.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3a4fa08c8---bibukafisedajenodusupi.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/tigebibopifikimefanelox.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130af96425f9---pigagu.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/39493981332.pdfIn PDF document text
    • http://www.siposferenc.hu/html/tebigusopu.pdfIn PDF document text
    • http://acelybio.com/upload/files/linubuxitagefajok.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/45149822797.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/31732397063.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/bifunofogefitewuvixewez.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/26434972345.pdfIn PDF document text
    • https://edarky.net/data/file/84294810947.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/31950901176.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c78edbe451---xewiluw.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/faa80afbf70fc513e5854fa441310583/xorimi.pdfIn PDF document text
    • http://mlead.net/images/e/file/99732574986.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/xadofitawizasunazipegoba.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/69060076781.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/75818916470.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/kizupur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=apollo+app+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_off0000ec67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001047d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047D 9968 bytes
SHA-256: 50cf33f159bbfa99c801d599a79747f3c2d4e36c2336f9103f8952eefd0ffd55
font_02_sfnt_off00011a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8F 18056 bytes
SHA-256: 24350a2fa88a49ecbd3c4401195ada6f9f74ba21d5159454e01ee3cc74f4e6e9

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