Malicious PDF — malware analysis report

Static analysis result for SHA-256 91da8cd1232ec9a6…

MALICIOUS

PDF

85.2 KB Created: 2021-08-04 06:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 05c6b0486c9dc4a9bdfbc961a9d50c57 SHA-1: 4ae6c4ddb3b1c8d2d5fb4478818b9ee9a5826b90 SHA-256: 91da8cd1232ec9a65b1e759b7835d215e3160deef41b8dd199b963995260b86c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The file's structure and URL patterns are consistent with phishing or malware distribution campaigns.

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://laborke.ru/uplcv?utm_term=easy+to+learn+turkish+grammar+dialogues+pdf PDF link annotation
    • https://essaidafm.com/uploads/FCK_files/file/83989781243.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/nakokimal.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/57e27ab98a90d99f71c6af082665f24b/bubotus.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/1072252954.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac892e1f26c---89217934500.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096660641bbc---zipugutisi.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/xapuzino.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f9be126cc---duxoxa.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/62892813540.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/iq1f43dpc1088aiojcpn3nrt6i/49903858418.pdfIn PDF document text
    • http://moneymaker-gold.de/files/lumonenozileb.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/wopotovadabopiweriku.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c33c0a7cdc0---85975046144.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/iaat1qq4qo47bd5vpt2otjv835/24547936490.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d29b0ca1521---33485348077.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/rotudibit.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609c156dad993---49896627475.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/7c2cad70e18870ca50d3408e87f87643/65389318085.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/2ieu0ub3jc6c9228l1f6cb2vd3/47898714162.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/vusarosulezepifapanubutow.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/40039580833.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/rutuguwutabumuvu.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799627d5fc8---44202509139.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16094036ea8b6b---45240729386.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_off0000e43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC52 11232 bytes
SHA-256: 35d1d3e6692291320272597af4476a98bdfddbde0a622855de88a56c628ed2de
font_02_sfnt_off00011645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11645 19456 bytes
SHA-256: 8cc93fe148b6c2beefac862b8ea513f45863c44a43fbfbd6304baf940cf8bd6b

Open this report in the interactive analyzer, or submit your own file for analysis.