Malicious PDF — malware analysis report

Static analysis result for SHA-256 798e002a319e62da…

MALICIOUS

PDF

83.4 KB Created: 2021-09-04 05:38:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ed968090fbd18955238ff789e09219c9 SHA-1: d9e1311d4bff094d59b2f7c626edb46688167120 SHA-256: 798e002a319e62da79ef8b8e2e6c7d0a4763754c0319063981e4ef6509aa7623
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a large number of external URIs and links to compromised CMS upload storage, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with the characteristics of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=dispensing+book+1+pdf PDF link annotation
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/7u7nntvuc5khcf830r9gt0q8b7/gaxebatopus.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6aa7291294---kapegupitibepunabom.pdfIn PDF document text
    • https://totounited.com/contents//files/jazogutaf.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/35hvud88itf5u5jl1mbbrad0i1/10297042067.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/dusiniralunupid.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/legipivajipodakamezeku.pdfIn PDF document text
    • http://foodchemsino.com/d/files/fumejirodawibogopo.pdfIn PDF document text
    • http://paulabenveniste.com/UserFiles/file/38257866441.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/95305496416.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/zetevatizumipil.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160807c94ab600---84176359586.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/tevijovugosunevikuv.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/23644124500.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9da4c4675---87327330861.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/d2e8n05me5n7gmqlrkqqlc9ftc/99799746224.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/salipimixumasaretabilof.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/5a0kdda2r1o9sbenl039rvcajb/60063848982.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/79477301651.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210728013331.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/45505758033.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/jnva89e61uuhumdtu1fvv6sad1/22533014585.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/b01f4obl0ufmkfnuhkijpu1tjr/76109878355.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/qblhsje3883iuvape8adj58nc2/36634718438.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_off0000dd96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD96 19212 bytes
SHA-256: 654b85109b3cee6ca6f38887024a5c0b886ceacfd09e5a0cff6ce0306101823d
font_01_sfnt_off00011095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11095 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128AC 10552 bytes
SHA-256: 299b0b02d4e14053ba1d9110d0f0465f7dd2cb4a60006cd17653b30da0645911

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