Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eb54426a600c53b…

MALICIOUS

PDF

88.8 KB Created: 2021-06-30 16:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: f1be36cb7e072c3640191ff1c785c444 SHA-1: abda2e0cebb1381e431192bf2feff8e5d42bfb6a SHA-256: 8eb54426a600c53b655107ec6eb3f5fe7ac0ccf22a9fcf9fdf8dcbd90781d065
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on compromised WordPress sites. The presence of these links suggests an attempt to lure users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160ab67f776f46---2949042028.pdf In PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/52591299625.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/rakijapeniba.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/537864737233f607f289dc6a729102d8/44463427870.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/bivowaxizokupefax.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/dabogabuxazivenenet.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/61591784692.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/sepik.pdfIn PDF document text
    • http://vhshf.de/File/mopoxekawegujigapubaxikij.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/fee31f5bfdab8a23ffcd6eaecd57091b/33348294551.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad65252eed2---dakewafid.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/ovhlpmt5a9v7e0d1480tdnclf6/xoxigutiveziloritovexul.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/38611817304.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/58464746721.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/e959d711ccffeb3aaeeb20a1826c212d/22570299695.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831e70b1bd6---nugivuvugamabupinivemonav.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/51263628908.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210528030204.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081f64ab55af---xurapagex.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608362b548146---90280218362.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/7cde24efce4990646b2a552c47eb9eca/wiwawamebo.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/e170dd796547b36521a3f9d825b82df1/50217889745.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/9b66a88c9447b4572c7da9c0f1210a0f/10099750432.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=healthy+the+organicPDF 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_off0000f744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF744 17932 bytes
SHA-256: a1acbd149d165a1d008066e0f8db9145617c28ce07c3afabb768b0f7f906e5a5
font_01_sfnt_off00012678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12678 10444 bytes
SHA-256: 413f0da233a95b9941a49006ee3827d7470c8a60cc27c346bd68be77c2659e05
font_02_sfnt_off00013e19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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