Malicious PDF — malware analysis report

Static analysis result for SHA-256 61fb1c882d624b4e…

MALICIOUS

PDF

86.2 KB Created: 2021-09-06 09:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 6f67895d8e1f479029786913ae7a1139 SHA-1: a371b8782f2a0e32ecbedcf03fefe310dbf947b9 SHA-256: 61fb1c882d624b4e372974948f78a4a23cc3270c745e130aacca5c199f242c11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and potentially disposable hosting domains. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to redirect users to malicious or phishing content, possibly leveraging embedded JavaScript for obfuscation or redirection.

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 http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720a7a3dfff---64448143190.pdf In PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/8d6a83ee3e3106ca6061d4aca17a7695/kigirugipixanawopulifupe.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/0435178f110ac61089816711cf399021/77624770014.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/1jb0erim7hq1iic8n1lp4rdnfj/fubukibutufovokunaf.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/32956316038.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210620231412_gdo8i2.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/7edb4c496ae2c416f801f1877503cd87/xewek.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/poxidapinafarebirotezo.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/kifevofuwewesi.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/gawesiwexezowemezafuta.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/88620304130.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f5d351521---zitegijexizofodefonopo.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef40ad72a6---gexelefezu.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b34ab355456---61469273930.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/33103205327.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/bc6f88a0f3bf4f676fd4c4089ddc7a4f/kisokifeba.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076126d558d9---sirawomuwulajijawisufa.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d992e4225c4---14601966976.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210706_014324.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/wadurojap.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/66065032202.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607170bd3475a---11511424370.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/dajuzusapujepe.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e89ba94e661---40241503540.pdfIn PDF document text
    • https://diaspoassur.com/wp-content/plugins/super-forms/uploads/php/files/7c54d409a36e899274d5aceb1c346bb2/viguladaviwevebube.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/gopenunagafilurabiwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=101+ccna+labs+with+solutions+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_off0000e4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CD 10888 bytes
SHA-256: 1aac2cc21f48c53eb830564e7615e0320548952d57abcd9f4f07805b62c72430
font_01_sfnt_off0000fdbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBF 20272 bytes
SHA-256: 37633a3127b50201485f5170c86648957f34ea644a70227eb2303181772457fd
font_02_sfnt_off000132a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1