Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee055c3cd56bfbb6…

MALICIOUS

PDF

89.7 KB Created: 2021-08-12 23:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1e0e233ceadcfadcb69361bac1237dd3 SHA-1: 891328d761531cb02daacbf05b1f74bea7e5646c SHA-256: ee055c3cd56bfbb62393ca0692eaba7d73354c249f2688f7b762cfc5104c0e71
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple external URIs and link farms points towards an attempt to manipulate search engine results or distribute malicious content through compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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 http://bowlingkillers.com/imgdb/files/57029422552.pdf In PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/806238d938764c7bd99174146b7c164e/doputuge.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0b45ce434---30362034041.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/q04rj6jiuf8vvg07aou4l19cro/sivepebigusilipufena.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/pavumitefuf.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/julipalile.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/tojezakifixeketekot.pdfIn PDF document text
    • https://pindimana.in/uploads/file/dajubet.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/7f887b44bbc543a1024dd227c506ffd5/raluweditubobu.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7189341e277f0124af9f8c1614db70b0/pajiwerexesesixuroveni.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/musajurudarazapetisar.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/lm66jbdg4pv9vm2b82otv8kn44/48588375377.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/63747137804.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/4d1589fb00f3317125bb7003a09e15e0/88407302330.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/pusotoduzexitefananekab.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/11505849690.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/41469111328.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/58545785457.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe5eb5aaa0---kitaretaxapekonomol.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/83546840499.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/jiritadaxufukiper.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/8ht5puva9m5vo7c4koo3fbsjp5/14661531709.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7cd52a89e---mejakuzebaj.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd83d2dc53a---tewivopewurutivaxuvuzix.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/96789443187.pdfIn PDF document text
    • https://12tiga.com/contents//files/26518107771.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819dd96c8d0---dijeluzix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=delonghi+nespresso+vertuo+descaling+instructionsPDF 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_off0000f96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11181 16960 bytes
SHA-256: 5cb41da815ff22c4bc2ec2adc009c2552780191818ed022cc59af40b20ac4501
font_02_sfnt_off00013dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD3 10960 bytes
SHA-256: 6447fab64c10d2063fdd8c99ddfe71cf432401e1b7a0551baf2c091b105c6dc4

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