Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd6648ef5de239db…

MALICIOUS

PDF

80.9 KB Created: 2021-09-03 13:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3e63e6fc6b4a1615a9944bc631a81720 SHA-1: e39160628377f334e0e4b5387dc05d30ea3b6974 SHA-256: fd6648ef5de239db5448820401a705fe61a0801cbfae0c29dc6f4f6554a562e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous compromised WordPress sites and other disposable hosting domains. The embedded URLs suggest a phishing or malware distribution campaign, likely initiated via spearphishing.

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 https://cructi.ru/uplcv?utm_term=les+moulins+de+mon+coeur+partition+piano+pdf PDF link annotation
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160935174a6694---31353511308.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f4fc837d4---73000631432.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/gewikagadagujaweva.pdfIn PDF document text
    • http://turatabor.hu/media/94169315901.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/7occu0rsbl5dshgrssmlhnqe7q/74340661386.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021052020340673499.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/977c6aa5affef79bd3f40dbc178ee774/nifuzogidaj.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/39417877613.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/193d9d03bed6d00c64f6c6bff3f5e600/3876502934.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/96494353660.pdfIn PDF document text
    • http://shosholoza.de/file/detomegazopozukozuko.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/20058880955.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/vugeterenev.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a47b09ac389---tuvebikafugimipebev.pdfIn PDF document text
    • http://mamam.by/upload/File/file/bukaba.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160e2ec9e4c50a---44722589960.pdfIn PDF document text
    • http://btfa.tw/upload/files/mepenanimu.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/6c71e389eb7d0aca77e42571feb8c691/80957026006.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/16941642560.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/bd44f8440f4444b3fba1e76d887da3e0/97462087994.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/d4ca5c43e390cbe5a780a8f9a3307066/jesuvalez.pdfIn PDF document text
    • http://oakgroveschoolheritage.com/clients/b/bc/bc5c94904a1f00f1300372e6f875146f/File/49223138334.pdfIn PDF document text
    • https://kaptenhoki.net/contents//files/16351729796.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/83101394468.pdfIn PDF document text
    • 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_off0000d236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD236 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA48 18992 bytes
SHA-256: 07110c6245a5c62b20b4b25e2ab6f0fc1c22dc7c50bc448f3124b8b4326363ec
font_02_sfnt_off00011b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B20 10840 bytes
SHA-256: 394d3460de24699b75651dae2fad418d9b93c21d1676b9e94b0834bbc81b05a1

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