Malicious PDF — malware analysis report

Static analysis result for SHA-256 6406cc29c3f9eb73…

MALICIOUS

PDF

77.4 KB Created: 2021-09-06 16:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e260809d289ffea30ec4f6fdd196136a SHA-1: 55194f26290568e246179bc653f5fbfbc2dd8493 SHA-256: 6406cc29c3f9eb734ea3fab5722076fd360c08875b4294ecd649afb01bd47ddf
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high ML score. It contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, forming a link farm. The primary purpose appears to be directing users to external malicious sites, likely for phishing or malware distribution, rather than delivering content directly within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crewmak.ru/uplcv?utm_term=cracking+codes+with+python+al+sweigart+pdf PDF link annotation
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/trf4ofror3t719iprsbk425u9a/totekujem.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/il8a5kqeurthlm39ofqdf75h8q/72253741789.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612afdf441d80---nirowenuxitidame.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/f9f14fb10446105587238d5d320fdf5b/bujugosodogebasetegogik.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/l9e93st9s0rhmt8s0vth7db9tr/89440484189.pdfIn PDF document text
    • http://spencerrandlefamily.com/clients/864257/File/40179843109.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/92500177014.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/litigojuxojixibajigesati.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b91fcd9f0a---tilirukuxebazu.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/26a4c912d5b259035f459a190a077400/25480822041.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fa43abc26---jalevudidumaberedasorog.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/85192721225.pdfIn PDF document text
    • http://fygl.net/uploads/file/300743268944.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/86088680587.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/65104055137.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e24b6e4d81a---32153389978.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/47448602693.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/novojuvitofumu.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/frifvuknfttg293nsvpeudbg21/gagedamaxen.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/xiguwireb.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/xorusanaxojapiserew.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///4028340925.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/q55ie3dr8eii2svl52mqqhj0g7/rozavuvinepuribatidapama.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/wuxetajurokiva.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_off0000c964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC964 17020 bytes
SHA-256: 529d6df928d2f551191d295ba12bca33d9cdb479d20565b75d14884f550b1e19
font_01_sfnt_off0000f59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59A 11220 bytes
SHA-256: b3aa7778f245302f3c2287961e9a92a2042e25f244afdb5b5a4d24fb6062fcc1
font_02_sfnt_off00010fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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