Malicious PDF — malware analysis report

Static analysis result for SHA-256 72010a3687388211…

MALICIOUS

PDF

80.7 KB Created: 2021-09-04 11:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2e2a488f1b4f21e4adddb7bf3ac5b35f SHA-1: 3919d94970b1b02e4d8511997fa0d667a133f782 SHA-256: 72010a36873882113f8e2ea600d2655c76a02f37d62883a70dd6d8bfc8c275a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting it's used for phishing or distributing further malware. The presence of external URIs and the nature of the heuristics strongly suggest a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=recortar+archivos+pdf+en+linea PDF link annotation
    • https://tresonance.org/uploadfiles/xonotekoxilamikilawuku.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//katujasufovazulu.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/69203593732.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/38752374440.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d8965d1665f---fobobabugolenavasororafo.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/mopexekosepuzojowebape.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/7051945612.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/fotaz.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e2dca0cd1---57389862134.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/92432037989.pdfIn PDF document text
    • https://tsolisp.com/files/file/tizonujujas.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/siras.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/16473864370.pdfIn PDF document text
    • http://sitepride.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/divivelewesinurosafus.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/wotodab.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/99357338226.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/f2e876f258203308751273b006bcbd41/6741093011.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/mefobolep.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/ripobugagowasifumerulabuz.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6a725e632---lubadazabuxixudonided.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/21755359668.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/96745428299.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/14439991432.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_off0000d47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47A 18616 bytes
SHA-256: f14b548a5ca650a87d47db449f6e57ce1acf5fd1b60a10d196b2bb687f4157a9
font_01_sfnt_off00010407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10407 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1E 10828 bytes
SHA-256: 1837cf288f9c151771bdab7e1ee20e815a1cfce48bd961fe42b94d02c812f8a7

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