Malicious PDF — malware analysis report

Static analysis result for SHA-256 a25ec208a45e2581…

MALICIOUS

PDF

90.7 KB Created: 2021-07-24 03:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5038f03b94e49d92f39129e07fc3c653 SHA-1: 2f60fc3760e91f1a58f232229e9ae857d18355e8 SHA-256: a25ec208a45e25813d8b988224f43863dfe2857d22cdeeae3c265833cb70b670
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites and disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or exploit kits. No scripts were extracted, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://coolingrealestate.com/your-home-cleaner/FCKuploads/file/naxotigapibok.pdf In PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/0d04cdc8c036d3ce1b26d1d07d476c47/95138418803.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f339f731f3---nufamiluwokefowurejaxuvol.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607877195e55d---35590579824.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e0c2f326c8---lorexufopukamijogiv.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/rejovitadoj.pdfIn PDF document text
    • https://activepymes.com/pub/file/mosujedelogeken.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///45751723304.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/puzotasasarujefuluxejukot.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607aab55b65b7---85919425893.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbfdd99d707---11987841833.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/6a5f34db797a559282380f6b9437e499/28802638093.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/t2qqd06ueqa7koguf29o5jjmk7/11001186386.pdfIn PDF document text
    • https://szud94.hu/img/sajatfile/files/wuxejopumibapexiroxur.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/tttha1h0u0qdsln8io7tusoan4/nofejotixijebegowofavet.pdfIn PDF document text
    • http://allasclub.com/campannas/file/nixiloxuvi.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/vlkn8atrnrt2avqpmg1f30q1kv/25661054021.pdfIn PDF document text
    • http://scmsalliance.com/clients/864514/File/zixewibipotawurisewelif.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609d34df5fc37---zorawurejudimulexo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f02879d5f---kiboganopipafavifemali.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16073ae09c7847---54659260378.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/746c6b6e6d4c45006b3ab5665c50b87a/30084375907.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/fee22b1a10343ce6182bf96070723853/4884138231.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/jixufajazatupinasuwipax.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/bae1b4116c1727eb98d70a309db3a39e/nexusifonukifizur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=orbitrek+exercise+guidePDF 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_off0000fe86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE86 10572 bytes
SHA-256: 8fcc3cad8c576e26218a4a0dd4b613f0c9cbf6e5550f898dd43e0b9b10115cd3
font_01_sfnt_off000116b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B1 16892 bytes
SHA-256: 9d92727f3950cfd880d84f10c9a9bd31a301d5b1ab113088a9225e1deed0ca29
font_02_sfnt_off00014280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14280 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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