Malicious PDF — malware analysis report

Static analysis result for SHA-256 4956b1c05ed3a8de…

MALICIOUS

PDF

108.5 KB Created: 2021-09-20 16:34:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0677c53eeb406e2c28e60f79a32be2c8 SHA-1: d1e82ca71d8d73cc816f252324c8a611865155da SHA-256: 4956b1c05ed3a8de66ed0abd16848b69b2270c4ea13ca260c82008a084275784
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://360clothing.in/home/www360cl/public_html/uploads/images/files/64895872049.pdf In PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/2a9afe1957af9729d3c5798f3df1db8b/zasasezep.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/xaviz.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/sewiwipisinexijof.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/mibijipisasunakesilojuxu.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/98463696470.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/vezifetunozugo.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/96346884604.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16134d0d95cb4b---dagupuz.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/3448425699.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/89438183363.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/rfm4q11k6nfnqb9g5ie6n94p2u/61724259620.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3d5ec30ca---77022950876.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/80440500304.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/84373276028.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/majegoleseterugowijuj.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/55656703056.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/45755562470.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/fejabobi.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/muponizukilozenikixul.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-18-18-03-25-9WCoaHEQ.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/39313684338.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=mulan+2009+full+movie+eng+subPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14569 22856 bytes
SHA-256: f2a20a83c548e06aec5574fe107ada45f2eb49790143dbddb8d7c15cc66b29a3
font_02_sfnt_off0001812f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1812F 11068 bytes
SHA-256: beccf59c38a05b840ebf80d25cd68aa5f1d5d08854a11c32dafd2a76cb8ed8dc
font_03_sfnt_off00019afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19AFA 1936 bytes
SHA-256: 7bce8bd2640a1c633f8cd84eaf224a94e47dd3494f9234b0f5ad7ff09c148fbc

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