Malicious PDF — malware analysis report

Static analysis result for SHA-256 440f2370bd44a35c…

MALICIOUS

PDF

84.1 KB Created: 2021-09-05 22:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1efdcc3629d6e94f26ddd0502acc2ae3 SHA-1: f2129812b623350557191323765499c1a0a4d715 SHA-256: 440f2370bd44a35c245f011c59ef9d292b42ac04dab98ceaa1af190d6d1d3eb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using such sites for SEO manipulation, often associated with phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://krisoc.ru/uplcv?utm_term=national+songs+in+urdu+pdf PDF link annotation
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/2e1219ffae8aa856491ef0e7f0f58e08/lapugaxinipuva.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/q69r87rp1fvc2hmne0d3s53n18/25882543891.pdfIn PDF document text
    • http://atek-ent.com/upload/file/92008928783.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd669be66c---poxerapobubovonik.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/56036594855.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cda174d68---12660526976.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16117060fab13d---41820341293.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/364b66nt0mmmacpi3a8cb4m7cd/92506477662.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/19264797596.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/kumunogezakex.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/6d7d15967c23dbca5e943fee49879735/46304329530.pdfIn PDF document text
    • http://zlato-stribro-investice.com/upload/files/79947255435.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/bn7045modobn0ulf9lb1vppalg/92059613111.pdfIn PDF document text
    • http://surrattsville69.com/clients/8/81/8122276c22396d7fa0996010cc369f50/File/5056438070.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/60152735815.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/5d560ca65c73d9649afde185d398af56/36704796677.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/gomusoj.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d580555da---2488699084.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/90704211735.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/munabazinuvasosivuni.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/j9r0r4rernb734vi4ej7mfajpq/jivutagozofiri.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/28461845053.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/78075964824.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_off0000df49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75B 19672 bytes
SHA-256: d8d48312fe9cbe1cd70e52ae02283ec7b8996ac5abd4dcd0e9da90411aa2515f
font_02_sfnt_off00012b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2F 10620 bytes
SHA-256: c97198e4fc06f0703e9b5c598995660bb325546360c4505def428bdf3261517b

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