Malicious PDF — malware analysis report

Static analysis result for SHA-256 e67080d3e8629122…

MALICIOUS

PDF

78.4 KB Created: 2021-07-25 20:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f0f36b25dcbe552c8c20da2152dd4d6d SHA-1: cf6242ddcc5991ad7e07d2d75071ec19a9098f73 SHA-256: e67080d3e86291224da3e9eac851a7a5b083accc43d2e64a855945b1bfdff18e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other potentially malicious sites. These links likely lead to further malicious content, such as phishing pages or additional malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a91617a9882---22850399356.pdf In PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/c3865b2641821f7f0c63008171c9fc81/wetexomuda.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/38939854833.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/vokupurotojiwutade.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/c8ed5154fad0b6e257f1c50ead0f8922/71698767215.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/b6b668708bf4961bc8adf06c1b49fc5b/69084993526.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/wuruvaributadifevufenumam.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/dpiuejlcc53183h79ejlpdqrc7/desifogujogakatasekatakaj.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/gupevegelulifedigig.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/908352659.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/15627edf2b5ae65af2b9a63798ac7a4d/tibajezerutonesapol.pdfIn PDF document text
    • http://pinetreerealty.ca/clients/55933/File/zofose.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b28d037ca7b---tozafoxawaxukepelu.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/fotamesuveji.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/2f857c71fd12c3d3f7d74e7d18d71184/24268142970.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/8kj7e29vdvnub9r4l4na0g10qk/56387556651.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/fazenaxusobib.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6ff418d68---58909449245.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/zaveri.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803184561e7---nagomi.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/88764565211.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075714a9898a---jajosixasitefaro.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/a677467e20e035ba73913e3df9ece71a/45181815555.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16095e4ad5a73f---78933134289.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/69619696303.pdfIn PDF document text
    • https://manenshop.com/upload/files/toditujovegakin.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff2a79b49f---muderavibexotajerejajij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=pokemon+in+hindi+season+1+episode+32PDF 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_off0000cebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBD 17312 bytes
SHA-256: ecbaa83f0c225b045be27576af521421367dd792b5a4544c69a8ef3b00192037
font_01_sfnt_off0000fa96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AD 10848 bytes
SHA-256: 5bc4e4eb2453c331dc75739d773e7c91ca27db3ec4152f39a90d84d1d009bb86