Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bfb4d5d441ef64e…

MALICIOUS

PDF

83.8 KB Created: 2021-09-05 07:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e7bed11652be0ccc4e798294751c1f40 SHA-1: ab6fbaf48ae00245b578789a4365a698074dd47c SHA-256: 2bfb4d5d441ef64e46f0e5141c25d2d2bb68c0672e60c28630ba0f67a1e178c8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were extracted, the structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.fuchingrading.com/upload/file/50870220747.pdf In PDF document text
    • http://eiak.org/upload/editor/files/94796856421.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/olf4haaj16c8s26m96i2m9hv68/bejezefoxisevivopiwinu.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/94361400129.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/31265699460.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/dusekububefa.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbdc68718f---82671433352.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/04ef4003a716391aad2a6e5f00de24ba/wotuvi.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/4ee8e91b90bcabd6c62fad2744829481/45381304892.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/67550354368.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/53350790935.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/17048373929.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/98d69aaa1f0806cdd625455407212645/79059843441.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/nesot.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/vokixofisubobazevumodu.pdfIn PDF document text
    • http://walkandwagforveterans.com/clients/9/96/96cc06f6b2a5429c1325f0b535cddba6/File/7656987313.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e90dce1db7---65781867396.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/3d0u3kmfg2jmahpqbk1qg0575c/jisatumojofowapigisubuk.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/xunegederiruwozerem.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/5940603350.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/0ac1fd19cb769aee9747876a12679393/19695117674.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/1d4a219bcb58bdea038d241e4dcba221/baruzapubane.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/44216743872.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/29527512571.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=editor+software+pdf+filePDF 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_off0000e469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE469 10456 bytes
SHA-256: 4be24cf21d92a842be1e5e73259ac33cbfe8cf23805e8ef9013f1daf3865998e
font_01_sfnt_off0000fc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4D 17740 bytes
SHA-256: 072b3c75430cd55b753952f22b1094eefb8d8c2e47ddcc79045c4baf96e90f9d
font_02_sfnt_off000129b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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