Malicious PDF — malware analysis report

Static analysis result for SHA-256 d711630df99fd4b2…

MALICIOUS

PDF

76.4 KB Created: 2021-08-12 13:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b1e6346e3d7860b5fa460d936578d88e SHA-1: e6e8194e81abd32f49609d31b27f9a459c03bc33 SHA-256: d711630df99fd4b2735bb4421a1244b03bd8b908055864700352c813bcb9eed4
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other domains, likely serving as lures or hosting further malicious content. The presence of multiple external URIs and link farms suggests an effort to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://catamma.ru/uplcv?utm_term=jasoda+sarkar+baul+mp3+song+free+download PDF link annotation
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858334d7f79---ribatimibosudoruzesukifo.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/48357613961.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/4f5b40dccf99d82ab6cc2432397ab1ac/pumoxabebefiboposi.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210607132333_t9e6wk.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160d6d80b32c09---17914389367.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/pikogesibunowalekile.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160cf45fe4e432---dodimikadani.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/905776c28a4417e1dbcd0de54ff584bc/1790257785.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/45416061875.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/bemavojunokolefeb.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/d447e07b8121e6eafcbc0bc2c718394b/ralotixerepope.pdfIn PDF document text
    • https://o-dance.com/upload/files/xuweridipakiwep.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16079e1b6d018f---buvorodenore.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3fc04b6ab---lesifoze.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/112adb3b4b4ffc6d77df7c56a8bce806/nolil.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//lezopa.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609283748bf28---72569684425.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/xokusumax.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/gixulorosawago.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160beeac47de78---fevojediximatemozavow.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/d6bd90f8851d26035a56a5a1a4b0f048/72511587284.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/45391983484.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_off0000c444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC444 11232 bytes
SHA-256: 2f7eeceda44f43d969ee861bd298f490719c117c31b5e92a06d90090d988bda0
font_01_sfnt_off0000de44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE44 16820 bytes
SHA-256: 40e397da11a894af5b59826f5a2fe4a6b10ebd2f275b111431c4447c779cfbca
font_02_sfnt_off00010a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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