Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8dbad00c71b03ec…

MALICIOUS

PDF

85.0 KB Created: 2021-09-02 15:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e93a3f9d227c257041328ea8e189c37f SHA-1: d062941cc8030fffe4ea4ac726def78c41a36512 SHA-256: d8dbad00c71b03ec62cf6d55583268d27abb4edcd46b5c5f1191bce0c7328b44
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://eastcoastbiker.de/sites/default/files/file/kexunoteruforureriro.pdf In PDF document text
    • http://hangquangauto.com/files/pegixavetutodejeniza.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/xuvanevajazifebamobod.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/12045121410.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/79758047119.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021061221103073.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/52272329303.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774c327ada1.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/8ju48qv7korvcd52th0jcce0jt/32612893572.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/1c378930098a0b6cab7471045cfe878c/goxuzuje.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/filifugepiz.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/748b71ef44013e2223d7602246158f41/nisevesijifowafigop.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a7c21ae75---gosobigirada.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/90583579176.pdfIn PDF document text
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/zerugapovozorosoputedob.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/4929914683.pdfIn PDF document text
    • http://highlandcougars83.com/clients/2/26/268573c5102cd00412bac87cee9346ec/File/wujajixevatepizow.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/fabedadugulabufopu.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16084520f5c8df---faparunabov.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e54066ea3a9---63263116785.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1de117ed1---16882719578.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/3be71acd5a0505c30c67856bcb654917/54417421576.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/fugodezefuxibari.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/juvarigesu.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/nj573lj2vc6sekqe2aepparp36/kofuxalozeje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=class+4+bengali+book+pdfPDF 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_off0000dde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE2 21028 bytes
SHA-256: a42fe147c6dbca9b5f1b5be565d062b9e1d0ca17564ae24557f55d32cfc417f7
font_01_sfnt_off0001156e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D85 10816 bytes
SHA-256: f9441d48d63d967f0be201592ddc8ffbfc6bbf959f4a46f48832b3dec487be67

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