Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c1c822b28b7d769…

MALICIOUS

PDF

89.3 KB Created: 2021-09-09 03:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8386f562d36000db878af3ab85c9588d SHA-1: dd778d5d10d7cdacc6473d343b2022873046aee1 SHA-256: 1c1c822b28b7d7697a8e2d28309f97faeeb00c88a0a8a6138013569e5a9e7c69
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

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://drafthe.ru/uplcv?utm_term=metodo+de+las+dos+fases+pdf PDF link annotation
    • https://svenjakretschmer.com/ckfinder/userfiles/files/gelizukojem.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/munopow.pdfIn PDF document text
    • http://itena.si/uporabnik/file/59443560180.pdfIn PDF document text
    • https://dintek.eu/uploads/file/walavojon.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/25065848789.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/4561806030.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/dosevigubipulelesule.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/53135760468.pdfIn PDF document text
    • https://parfumzone.ro/files/file/83145045172.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/77224660906.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/51869613036.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/92906366960.pdfIn PDF document text
    • http://dsagco.com/Upload/file/tufaxoxojovuworizi.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/fui3pcmqsb5n8sqctgkd8fa8u5/wekokitafepefebuzivagexa.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/54630187461.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/42807960223.pdfIn PDF document text
    • http://briztravel.com/upload/files/38933834028.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/temuwi.pdfIn PDF document text
    • http://jar-ted.pl/file/63113931628.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/a1aabaac8ddd59be3c1643f16fd050fc/71195849799.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613485cb4f096---1539296453.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/40492356909.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613216dab166e---36011885523.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_off0000f749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF749 19180 bytes
SHA-256: 3cec04d5923d05c7f52779a53016fd32d204d49c5c28bef7f37dc8307c2d7555
font_01_sfnt_off0001286c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14083 10188 bytes
SHA-256: 0b194016e02c9f5e19a77ece19e5bc64ad9256edf982f94fdbbf9bbe1dee6f0c