Malicious PDF — malware analysis report

Static analysis result for SHA-256 de4b4f7b6fd090d2…

MALICIOUS

PDF

120.2 KB Created: 2021-07-20 14:35:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 852e43f170540d0571a1e5de000affdd SHA-1: ba9468ca7351bc33abe9a6e681dd86229dce7bc5 SHA-256: de4b4f7b6fd090d224f00da0972e6ed5dea30c34bc474a052ca5933b57d1d592
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to websites that appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/d2ac6b63afb137c4bd430dd6d4d065ed/92047222109.pdf In PDF document text
    • http://darec.sk/files/files/bimapexagilol.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160aa668eb4c18---47948624130.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/bidabajakomurodarete.pdfIn PDF document text
    • https://melz-feu.ru/upload/13540393922.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/84f1ab459a26afe648bff3f1746e881d/34096862913.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d3be261b032---natubojijodaravakana.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/66232283952.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/83188767039.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab688cb06ab---10789519694.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/j11p5tp004lb1n0gof3obab33n/gatox.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608444c3267b6---rivovafufaxegedezu.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0755834f79---47279190886.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/zakutowesuvimojalobe.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/kududokeruda.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/mazujeda.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/q2pqa2os2rjfqkondn6k3cvqhe/20799817922.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/19193278422.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16078aedd22c31---78966460738.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608178ca31c70---rogifagoroburisofezu.pdfIn PDF document text
    • http://agriturismofattorialucciano.it/ckfinder/userfiles/files/budutuwevotebumupa.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/16469374496.pdfIn PDF document text
    • https://actor-conseil.com/files/file/47956678843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=chaos+space+marines+chapters+color+schemesPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/c618f4f3f6f2516bfe6ce72e0d1aa1f1/9185017968.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_off000175f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175F9 17080 bytes
SHA-256: a181bc824f59bb44cd312c33c99e9f005a2f24746efdfdbc12f9e20576dd522d
font_01_sfnt_off0001a2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001bad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BAD4 10672 bytes
SHA-256: cfb2362f8be1ba413a4d36db99c200dd359e411bd19046c4d526055399d7a267