Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7759b8d367f2d26…

MALICIOUS

PDF

86.4 KB Created: 2021-06-30 05:41:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f7fa356eed433c0b1f46b02a27ad69fe SHA-1: d2088148cfa9554612104e30694790ae30e9985a SHA-256: b7759b8d367f2d2698c98e5207a7676c0cc5f3a6d85862f5761e19f3d224d0e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware. No scripts were extracted, but the structure and embedded URLs strongly suggest a malicious document delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://wastran.ru/uplcv?utm_term=how+to+clean+ivory+piano+keys PDF link annotation
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/8jj9kfefikm0c4inli9vo22dsh/getuvaf.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/8890d8f9bbb7a3de9f1c91f39ae885fb/13100185121.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbef6b5b62---18203838263.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a96f8fafe---63821773225.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/crr28tt7acapd651tdinh0fha3/44560292626.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160985983cf215---pumirewixilakozi.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/sivewodojer.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609860add745c---35336774992.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/a22cae0b96c0484d5f0da1aff9c85653/7472155364.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/a6c9bda3d9026538dcf6f580a71dd734/zudevotirul.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/13646069827.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/94658041023.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/37541428788.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/93000424771.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/58202673747f24f533d3b150365ce27d/venorolanasa.pdfIn PDF document text
    • http://apvn.info/userfiles/file/46937221583.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608526e264a69---mukimurugakipozasa.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/81988350033.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c91fb96312---22850090727.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/4b526d07755a7197a72e6ceaf5d0f0e4/remerutibosubax.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082ced2b4af6---ruxawosixapenefarufejuge.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160805db02963f---paxuvedeseve.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/720989fec5b48bb5e03c917a32effb64/fibutunamabukusomidixo.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee395042f2---gelapisoxeso.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_off0000f054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF054 16660 bytes
SHA-256: a158eb33586578362229d22f1e0b55f24eb22bd9aef5dd0a10f0cc593ac26c62
font_01_sfnt_off00011b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7D 10716 bytes
SHA-256: 7e9e34b11359e5ae528a7204049b6f236aa64336ce0a0a44b4c52e92ee9c0584
font_02_sfnt_off00013448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13448 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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