Malicious PDF — malware analysis report

Static analysis result for SHA-256 055d0c0c6acff340…

MALICIOUS

PDF

79.5 KB Created: 2021-09-05 20:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b0bd7e94779e30da055693cd1aebe910 SHA-1: 61b8622817f67b23fc1c0a8ff8326671c4f2d9ec SHA-256: 055d0c0c6acff34035150f849a1384f5308fd83c05d3698a231ad347c7826394
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and link farms pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure suggests the PDF itself is designed to lure users to external malicious content.

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://crysiq.ru/uplcv?utm_term=operators+in+c+language+pdf+download PDF link annotation
    • http://renovator.cz/files/file/xufawevenibarobexojirori.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/80fbfad2a97cd53687f916433b1b9802/72156052602.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/voniwegigegulusizepenozid.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/gamolevekodusojupurikujid.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a4baa39864e---39975778259.pdfIn PDF document text
    • http://broadmoor80.com/clients/866172/File/47923856467.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/lipobobonagu.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/21503175180.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/fajupufa.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609922492eb8a---95568056886.pdfIn PDF document text
    • http://fivesteps.pl/userfiles/file/sidef.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/27516345783.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/bc94e76759505b53d230bb4b589243c5/42395886778.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/36127675497.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/395f9c7f3ae68b1dccb896de8737908f/tarojuxafojuronitage.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/d7aa92146d5bbb82110f220d415d1fd7/banipokapodimawojanawiw.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/f682a54bb16af8a8224788eafc2edf03/40188400268.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/wimegapudozunamavadisifa.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/samofiwavabodewofobita.pdfIn PDF document text
    • https://club-sports.net/uploads/products/files/85973056630.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_off0000cb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE354 11004 bytes
SHA-256: 55d3c7acfe4d3f3bd70bdaecf4fe4e199fe36c8ee181dbeb1449c189bd6ba8e2
font_02_sfnt_off0000fce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE6 19552 bytes
SHA-256: 6a6b47a48ce4aa9d75ac831c91c424e1fff4ddc31a3f0cd094be711a69ee567d

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