Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9de57e0b350f992…

MALICIOUS

PDF

77.2 KB Created: 2021-08-29 04:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 663fa5ae138a39a5f2606c5bdc5de08a SHA-1: a781a6cfed256ab45081ec1527ba56ffd0938b23 SHA-256: a9de57e0b350f9923120681cd8bc8d04640d24d72d3a4dfb897e16b26f125811
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It functions as a link farm, containing numerous URLs pointing to compromised websites, many of which are hosted on WordPress upload directories. The presence of these links suggests an attempt to lure users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://harmonie-avion.fr/actualite/files/jufujukogerakijifipetimov.pdf In PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/mofil.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/tepesatanena.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/7fc1210664d6b09805365a3ba9002732/masaxakes.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/3f8d90f5d186ba2ece49b8caec5c3997/vufujomuga.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/jidbe3c2gq1ffc56c2jc3rb968/24259658118.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/413a4dfe353c767b3b1b7daa60d04fdf/75749709621.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/fiwizumevu.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/mixota.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/5a02f2d4e17593486e8cbd0d4d513f40/74044455129.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/c3138443995cfe0ed508aa8773ddfd95/24487609871.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/nuzisajezowixazox.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/4c06cf964bfc487b2b9e0a6c1a9c06c2/tipoloxapunika.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd54f9fe74---zonajew.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/772647438.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/vatum.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d42b0dcfe63---zegafogen.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/kezeluwazaxixi.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/ae9327acb7a89b70af778fef0fd358ab/lovuxo.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/lotedif.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c94d8dd6254---kosuzanusesekujukokozeb.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/kolutikirem.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/527b6c01091dc2f5e5ad0e346fb92af0/sokofenikalaruvamoner.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/zebedasizipirajaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=does+a+nose+piercing+closePDF 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_off0000cdac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAC 10452 bytes
SHA-256: 0b6664b9c1b32246483a94f9452ba7876d2d3cf5de4612db5e2eac89b4198ae5
font_01_sfnt_off0000e57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57A 16456 bytes
SHA-256: ce6dcf80f1e063d237dbf4c4face5e821ef228db4745c27e1ec316634dd7bd32
font_02_sfnt_off00010f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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