Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9dbdc255179e7fa…

MALICIOUS

PDF

87.9 KB Created: 2021-08-20 05:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: acffe1b4c50a2a7e1adae6f38949e1d0 SHA-1: 9c4ded2f714109ecf65f76a036fd07bb59cd7092 SHA-256: f9dbdc255179e7fa3ec2b89c0715501d03a7fffc97d42ddc5ee3e24244442247
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute traffic to various sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://cn-biyoute.com/d/files/6629365291.pdf In PDF document text
    • http://adabaskimerkezi.com/upload/file/xuguxuwegidum.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/75086179739.pdfIn PDF document text
    • http://agrion.org/upload/fichier/14060745635.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/43711445661.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/94703803572.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f970262645---wobalalesudonalepimiviba.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/qaanbdp6t71qjqtl16asuo9lae/73731901990.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/161149fba8ffe6---35719308203.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/ponazupebogeb.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/buzabijoxelazukupakep.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16073a37de3379---26340374631.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/rakukesoxitedifox.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/17931444851.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/55689740778.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b181cb4d67d---vukokezufix.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bfb24eb2f---86586713262.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606da4ae39ef4---73285066969.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f8edb38e---57556335433.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079b81602e1c---tunosetupaxe.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/foif3c93s0u57kg6obaakmsgp1/gadadubazesegikixe.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/79480090960.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=what+does+the+bible+say+about+dadsPDF 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_off0000f635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF635 10488 bytes
SHA-256: 8d8401c8e3299e009ff5445d79a7b48438bb0032c6fb5899383e33b4bbc6f64c
font_01_sfnt_off00010e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12642 16796 bytes
SHA-256: c265259872501f2584bdda6f866581578034eedf244f047529fc51c162f642b7

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