Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9f66d75a693b5f4…

MALICIOUS

PDF

84.2 KB Created: 2021-09-06 18:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4a96fafb3074eb10e0f7bd62ca84d7f2 SHA-1: f6ae355aae686ae294ccc049e926ad4820fec3cf SHA-256: d9f66d75a693b5f4b9ae1cfb3e6d6d707f26004242e63e19dbb88d3c8b6c5a40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via embedded links. No scripts were extracted, but the structure and URL patterns are consistent with attempts to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pistant.ru/uplcv?utm_term=frutas+com+baixo+%C3%ADndice+glic%C3%AAmico+pdf PDF link annotation
    • https://kisikana.hr/userfiles/file/zuwileruragukuk.pdfIn PDF document text
    • http://parentini.it/userfiles/files/60190369123.pdfIn PDF document text
    • http://nlureunion.com/clients/33063/File/54681215356.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/61792000742.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1b40a8f30---wipalorejeferukusuxiraw.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/92573655337.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/1eba114ac92493098b4f29cc0248560f/gozivojukiposoge.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a2688b1e8c5---95961410130.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d43c3d378ac---kinobozixitugi.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/15913169246.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608193b715774---sobegevifapul.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/jelisipukakaluvezugutuvox.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/vsoprqj8qk1vg698lt2j63qabg/fedaxapakuwepepudevafete.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf48188ad0a---40245175102.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/wevexemutesapo.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160de7215ae326---99055944537.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/emgk4auqcvks34llsoo29qg7vd/37584829275.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/167321970.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610fee529103b---dolubusiwumeladulibawo.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b10006e6d76---81989232001.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/71398472479.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/a57add547388ab14f8174ebb4c1acbcc/67668214092.pdfIn PDF document text
    • https://advertisementnepal.com/ckfinder/userfiles/files/fivov.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_off0000db8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39D 20544 bytes
SHA-256: efc0cde4fea2197c9e8af808865bf2e63634a7b57393eaee66796c700ac97d6b
font_02_sfnt_off000126d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D2 11504 bytes
SHA-256: 6ee611521de88cf97e53e1b55d8963b443133b2b0adb0240c7c8a920b3186117

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