Malicious PDF — malware analysis report

Static analysis result for SHA-256 da4026eba0511d30…

MALICIOUS

PDF

90.9 KB Created: 2021-09-05 23:36:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 31f8cc0882cf982814045ce50d76edf8 SHA-1: 8654aaefe0c843f05403dc2086e4794f44397142 SHA-256: da4026eba0511d304608a0632fc67cc4de232a9245a130bb3ee4bfc5d64dd3a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure strongly indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://queure.ru/uplcv?utm_term=lego+friends+stephanie%27s+house+manual PDF link annotation
    • http://drukarnia-warszawa.pl/pliki/file/38854415972.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/9d4e55c3eafd17f10907e7efa6dd3d03/55339400608.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/zaxasewo.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103e741855b4---banen.pdfIn PDF document text
    • http://totoumi.jp/upload/file/46273595926.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/pawodalivanurinofug.pdfIn PDF document text
    • http://net-marketing.hu/images/files/kunusevetepuginasud.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e124c7437---lopibedopobimukim.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c1713804f10---zitemerajixina.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/29a19534e8f82dabde77f8cff196480f/mixumokofudasinonipowor.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/6d0a4db9936da08bb26c1f039f8029bd/bisofikorigokomufipon.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///82391372480.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611858bc6d126---sovadakuvame.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/22069364546.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021061522435480554.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/4b208209311bc7bac81c97d0c4760aeb/30339021737.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/simazefalazino.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a47488b7cf8---59365968210.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2836393261---13031772850.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813d3553877---widivunobatavemula.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/bovumexoramezedojunulox.pdfIn PDF document text
    • https://fishboat.hr/files/tuzotimugixumik.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/7u46u8lq649v4v5fapk7evh2hu/xedazaxe.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/1bpo9vlu5u9suuivd2rnrfoibl/timejevemobevesed.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_off0000f81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81A 11036 bytes
SHA-256: f405555e27eb22c98294a1a87be52caeb76967756b6ecc4c66cc3e4dfaf53b5e
font_01_sfnt_off00011163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11163 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12975 19208 bytes
SHA-256: 76be9bbdc317c12c5d2c3e2a3d6b21c7a6a871734b36b56adccc6374ccc6b2c6

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