Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffbc3d50cfba1b91…

MALICIOUS

PDF

83.9 KB Created: 2021-08-22 07:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 733889fef5198174df7d0c058375e7ac SHA-1: 0624f5929a701627e7bd1cb943bf21b46bee5303 SHA-256: ffbc3d50cfba1b9181402302d057eb8bc9643238144ad299807baa5bb0e43b12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to potentially compromised or disposable hosting sites, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://store-connector.com/_upload_bilder/_filemanager/file/seditujem.pdf In PDF document text
    • https://hotelite.in/userfiles/file/kegefalavalifevejaju.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/23758527350.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160934043f0efc---72514196690.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/gupoze.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/j22pianvnraff2ue9556h3t66u/rilenufupufesogonimikaj.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/bcaeacc9395258e62f5a17e17af3e4ca/butolivezizete.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202108200548518146.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/xefutuvoripefojagotafojig.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210716_447E48554E6EC6D7.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/ae07413a5df3e5ad9574b1e54a8999bf/zudiwawiwodoni.pdfIn PDF document text
    • http://synphabase.ch/upload/file/61561925777.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/40768332854.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160873172e1479---6856861328.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/30770941851.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/76796968000.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/dpnu80t7ojgi7rk6ag06ki29kl/rosuzor.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/f05d11eb7b490c0b28ecb65a30cc8dc4/50844760307.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160ae02a7ed928---8570699894.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/436a2eb342a9a4b3d5505993f5523631/kuzifafa.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/judigeraribeferiguwin.pdfIn PDF document text
    • http://from.ua/upload/articles/2021/06/13/files/26099039859.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609078df891c0---sarotutenupagut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=avon+december+2019+brochure+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_off0000e2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACA 17296 bytes
SHA-256: 95ed6c4bbc1ccf8b67316469f428800b42aa55c427d06d5009d39ec26312704d
font_02_sfnt_off000127af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AF 11068 bytes
SHA-256: 3e9ff309b76c88bbf96f17e54e70481a125d1d51d4a5a37acd0f5e4a1728641c

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