Malicious PDF — malware analysis report

Static analysis result for SHA-256 213f034b3f8bebfb…

MALICIOUS

PDF

79.6 KB Created: 2021-09-07 09:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e18d0837485e65e37b6be0be1aba9137 SHA-1: 1b3bac8bcbfcc801435bb33b467f2fd6ddc18f4b SHA-256: 213f034b3f8bebfb1676fae94a54d5370347df4ea91fa55d23a1626ff35d8b9a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve to redirect users to malicious sites or phishing pages, a common tactic for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://pr-jam.com/ckfinder/userfiles/files/84795553183.pdf In PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/megusizejel.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/pojesu.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160849bd06bb0f---gijusilozukunonujadexepo.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/d3fa243369b55d117eaf059cbec5c99d/dametajalugewilo.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/76731712254.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/bukudalilofuvijev.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087c6a2367aa---zenibitirerefibimudela.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/t0gmvtjslc3bqtvd9g8drgdej6/42963997496.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/38048294978.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021080506060682.pdfIn PDF document text
    • http://armanetti.com/images/80159977267.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/c6660dd527f8e3165be4ad41e23cf65b/pibofixize.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/640225816610580a91d5e1.pdfIn PDF document text
    • http://brukbet.com/user_images/file/2624888575.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607464ec25392---59444579772.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/v2mmfeb396via6o4ek37jie9f7/leradusofigakuzik.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/tusibodep.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/rp8ku7bru02002vtf0uho3stg4/85679735080.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/4c5afhnlt2ostdrm7aaal62cc2/8683913340.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0e7bf06c9---21024492635.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/87ee79935dad4258b737e3b5fe3efb00/59129552456.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/15927706912.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=brilliant+answers+to+tough+interview+questions+susan+hodgson+pdfPDF link annotation
    • 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_off0000d13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE951 17288 bytes
SHA-256: 9f36e5fd1d23daa619910f6374a2953a9ec0ff41e12cbe2cfb51cea9f7cad36a
font_02_sfnt_off000115dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DD 11228 bytes
SHA-256: d09e9642d6c6577cf8c7b45959390605230338901abac5e0b44e502550ee27a1

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