Malicious PDF — malware analysis report

Static analysis result for SHA-256 283cb875bc8b3a1a…

MALICIOUS

PDF

81.4 KB Created: 2021-09-19 15:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5e47c583263417123f10cf16a1adead4 SHA-1: d63b66a34366f6e6c706aafef1668661c94e4aed SHA-256: 283cb875bc8b3a1a44f7c8014a4f745cecc7e1b902179d37c9eb8528976bc9cd
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which appear to be part of link farms hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, pointing towards efforts to obscure the true destination or leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=aplicacion+android+para+escuchar+radio+sin+internet PDF link annotation
    • http://wuxihemei.com/ckfinder/userfiles/files/20210916_012914.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/telanagegubiteru.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/25719789044.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/tesufemixipebewel.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/99675124078.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/22896706397.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5667ef003---bajobimabunojamul.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210904_AE114A9711A1B396.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/fopagojebaketivizija.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613580f2d0566---40679739723.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/fivevuxamitadowul.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/3607096153.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/65333397253.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a157c64694---xanekibiperurapo.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tawalamuwonujazaj.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337667103ef---74428998236.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac2f7639ac---tinekolosodawita.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109072314096204.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/rogugisorifizitarigasi.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/rejidejemejodora.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/fuzazizolugumitutig.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/somababofumuvirosaneb.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/mabatodifi.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/f80b246f03d6cf680d73507e1e0f4dac/ginatasizijujagatiroxuted.pdfIn PDF document text
    • http://santabruna.cl/upload/file/22195270583.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_off0000d9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EC 17708 bytes
SHA-256: 250e1c8864179d3eececf58eceea7e2ab99f5e1c67e619371735c3f0e7dbe706
font_01_sfnt_off000106a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB7 10692 bytes
SHA-256: 1d602f8fb99130945fbb79faf4dabe809be974dd725bf0f692921cd61dc438c4

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