Malicious PDF — malware analysis report

Static analysis result for SHA-256 f753a83cbcd852e7…

MALICIOUS

PDF

110.2 KB Created: 2021-08-23 15:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e8cf3ae2208bb75b9e2a3c3a496a8fd6 SHA-1: 4e80063bd4d6082bee33800f237364d77126ce42 SHA-256: f753a83cbcd852e7215dadc0628f1a2f091bd0d00406342b7d9f595c3c3e9514
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites used for hosting files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of multiple external URIs and link farm heuristics suggests an attempt to obscure the final destination and distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://crysiq.ru/uplcv?utm_term=quote+meaning+in+marathi PDF link annotation
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/9f8f6674f66fb425d92413ff1b5d4ef5/5882019029.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/wakiripuvetugopurax.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/tudir.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/funidemu.pdfIn PDF document text
    • http://apvn.info/userfiles/file/karagidutuzoxuxidabuz.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd6bd538ff8---majegumexaxitinabaporago.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/e46f53359cb212f02df8e3a154006a6b/gotejejo.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1610319ffa8813---malowadobuzas.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/1a1f995154385d73f20a7b575845b2e4/japavukevigusukogi.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/62594224527.pdfIn PDF document text
    • http://lovellreunion.com/clients/4/42/420738e4954c29d3cfd02fdb1bc9139f/File/sakubeviwosuw.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083aa13ae1c3---14240209865.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607e877a59f34---95265165851.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/5fda6efe4a23a8b88d6665b6374d0c76/13833309923.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/orprb1istovpk4c7qn4hqig0a4/38369069820.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc400b9e8f---33823685445.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/46227186722.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/puwafoxilafojuloderefo.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/70430a902572d53a031f94be9c455710/12587420954.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/sujabis.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/mozawurul.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/55746355144.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001342c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1342C 19640 bytes
SHA-256: 51a43921513174d7e63c05fa1e9450af4afa5b1a50b69e5ef21487a8516572ea
font_02_sfnt_off000165f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165F3 16244 bytes
SHA-256: b1ef7b52ed35dfd01120c19ee4193d967dc828f2fc549fe1a2d8c3c5029b4647
font_03_sfnt_off00017bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BD6 6140 bytes
SHA-256: 219c1e070fd2fb92a7c59e991d84cae3e098b300702b56d6c59e9af2db93c407
font_04_sfnt_off000191ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191CE 10500 bytes
SHA-256: cc01928658e70627e0276e4f60b001c737cb5078f408c29499fca52836d439f6

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