Malicious PDF — malware analysis report

Static analysis result for SHA-256 6943a71b60660331…

MALICIOUS

PDF

93.0 KB Created: 2021-08-22 03:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b4bb68d67ac086409e30f712aac60de4 SHA-1: a7c6cbe6063e1a645e6024ce01591061b0969453 SHA-256: 6943a71b60660331011881e14021f7f9a72e9165c2e52faadb0199b75725d119
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, likely serving as a lure to phishing or malware distribution pages. The file's structure and embedded URLs suggest it's part of a campaign to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://oniceh.ru/uplcv?utm_term=explain+the+importance+of+maintaining+manual+in+line+stabilisation+%28mils%29 PDF link annotation
    • https://landatur.com/files/galeria/files/42546537666.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160983f375aa4c---1965116921.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/32309753985.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/dupagirozivojobulupinuni.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/dd9f2havlikclvoifbp5nqsb57/20325989445.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/67363406447.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cabf32dd19e---60601628498.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16098780b62c80---zidebipamobiwetiki.pdfIn PDF document text
    • http://cga82.com/admin/File/31767138370.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28885c86f6---narimudisalomopudofisava.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/wutudam.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/68343608188.pdfIn PDF document text
    • http://zlato-stribro-investice.com/upload/files/zakinapuwukisam.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/gidefopoleniwidepe.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac28afeac29---pegosin.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160753ab288474---21012496543.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706a3ff32ad---58374967816.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7e11280f6---23323697270.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-3/20210503094350350719.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da122115763---bitufigazususopaxaj.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/savabawotexumiferogajowo.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/sobupulebanadojote.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/kejagew.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/86611281409.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/a6a200217a6e111a673c8647817b8b22/51831495485.pdfIn PDF document text
    • 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_off00010020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10020 11408 bytes
SHA-256: 74a4102d06c149b7c2b88743c7486609744b215a8354d6af2964c1b735dafb4f
font_01_sfnt_off00011abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABB 18384 bytes
SHA-256: f3e99428e5d96a44bab4b92123e948086a8916a777805e70cdd981cefa76e8aa
font_02_sfnt_off00014aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ACA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1