Malicious PDF — malware analysis report

Static analysis result for SHA-256 3efe68773699d906…

MALICIOUS

PDF

88.8 KB Created: 2021-07-10 12:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f38edccfdd50f7bc44411f0e4d68db45 SHA-1: bf27cd0e691ecadbd2d7a41f0ce26173219d4bc3 SHA-256: 3efe68773699d906f3a8c9a3d9923dbe7ad8eb9643f7177fc3a70c8c0dce63dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites used for hosting malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://drafthe.ru/uplcv?utm_term=how+to+take+note+on+pdf PDF link annotation
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c08214c3b95---lifafagulejapakevasona.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/19208910650.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f3faf5fc7997cf60db1427ef3f0a41be/duxodajikivi.pdfIn PDF document text
    • http://zxsolar.com/d/files/34811066248.pdfIn PDF document text
    • http://www.miwon.com.vn/app/webroot/uploads/files/zetavewiweloxezevadaram.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16094c754857f4---15993825597.pdfIn PDF document text
    • http://kaies.cn/upfiles/210701175448252729s02ho8.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/8b46fb901a5b25404df5fceb3a0e05a2/42278202874.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/emjn9dlgjherj9b3bfsf9cjibk/54518548138.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/nokadavunekotap.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/0c2js3q8brbp51prpf7c2t0k71/30138042080.pdfIn PDF document text
    • http://deficanderel.com/clients/6/67/674a09facce11b7629d390eef9534ff9/File/doveg.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805c151737a---zoluvu.pdfIn PDF document text
    • http://envigest.cz/upload/file/pipud.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/0c8622d1ed00bfede03e2ab71fdfaad1/34498137716.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/d9el34dhrv3825mde45ojpv0v6/dafezamad.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/28f9c4ad587daf0e64dba4b526c4c6aa/99108119592.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7302be382---regixefenom.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca093ec70d---81807422810.pdfIn PDF document text
    • https://eternalbliss.net/file/69295480115.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/8v490b6oae6m1fq32hgm6a4211/95392265985.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/88335368077.pdfIn PDF document text
    • https://reinigungsfee007.de/wp-content/plugins/super-forms/uploads/php/files/1rg2ut8qk6eellv8ovfif4v0ib/zijudem.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e5c172214---61472145884.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/c756c9009405e06c9c1177ddf9fba1c2/moratoboj.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/lif9vf19sa6esfnu5pf0ruhr9l/soxamoponuwalivubopuk.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_off0000f922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF922 17336 bytes
SHA-256: 985ab67cc6cc2a8cba84abd461a718bb79a04be4c5b654e1b50d25b8dcae9383
font_01_sfnt_off000126ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AE 10252 bytes
SHA-256: 52484dc5c2083c43f688200bf451f5ea7de9562fb13c9da8621c4143bf8488d8
font_02_sfnt_off00013ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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