Malicious PDF — malware analysis report

Static analysis result for SHA-256 285bdd0fb662ff2d…

MALICIOUS

PDF

77.5 KB Created: 2021-09-08 11:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6e88ca68245e1e94b985764772284e34 SHA-1: 5519c10ed2b4d5c89d69ef33553008e72afcc1e6 SHA-256: 285bdd0fb662ff2d356252a67cd56bba2eada274b10bdb4b5c9d995c206240ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document contains numerous links to external websites, many of which are hosted on compromised CMS uploads or appear to be part of a link farm, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/jvodo4n2g559u34ob3us8o7q8f/doroxokefurujetukasev.pdf In PDF document text
    • http://klawiatury-foliowe.pl/_data/file/siposetadodubu.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79ab47bc84---38223296213.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/tubudatabowolesozuru.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/58695109078.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/tegora.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/29099039775.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/19168977023.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/km96gtfj4lvgb3pdbv6beqe3ft/48362372030.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/0d4a4cac142559ae0aa0f09f7bd440a4/getaxivuruviwemobe.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/nv4nf675fhmvf7338g6jpma4mg/ripomorixuxolomejisel.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/90846040931.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/wowixeridafalasegevefodaw.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/75753002817.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8bf2a433ab---41908915633.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/zezotepokewexoluzuzafir.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/xabanepeso.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d82f5503ff8---30959928028.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/kanobuzitonad.pdfIn PDF document text
    • http://intergeored.com/upload/File/repoweguwekirin.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/fakofana.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b958ca077e3---zirufexorim.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/ac019bb844c77382478572db04816781/tisexobo.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210702_818E179B9D634D76.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ac809c9865e---4164564820.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=self+introduction+worksheet+docPDF 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_off0000c7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A1 10764 bytes
SHA-256: d60178ab691bcfb77c1786120835d78aef24981602d881b6f604524c1167fc04
font_01_sfnt_off0000e063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE063 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF875 18308 bytes
SHA-256: fd9b964147c250217ab1f8a295ca18b67eb7cfa6662d717491420e3a9bd69895

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