Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5283848aabcd2fb…

MALICIOUS

PDF

76.2 KB Created: 2021-09-14 05:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9cd3addeb73f5379049906b16b256c6a SHA-1: c8ff2914d1c67706338f9dbb3906360cba51b075 SHA-256: d5283848aabcd2fb978b5369d578ca5b20ef256967bdc821a2dd31f1e440a909
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with link farms and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://infrive.ru/uplcv?utm_term=blood+on+the+river+free+pdf PDF link annotation
    • http://bjxbw.cn/userfiles/file/jimeguri.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/52950818497.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/lojagavebifumejiwu.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/35878783935.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/90702381596.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/litamemonukibum.pdfIn PDF document text
    • https://alpinashop.bg/files/8246853957.pdfIn PDF document text
    • https://empresa-venta.hr/files/4701864038.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/fiwejurozupoxovasaluvakug.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/2oitld3o3g2ngl51spa99jnoqm/bezazedekiwenolinamorixed.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/tamijoxononu.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/88027282694.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/60960706878.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c78b9ba855---vegewuwaz.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/31349906656.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/susuwejawisunelub.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/kofopevekufubag.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/pugifa.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/92267331189.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/18517450724.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/29685276843.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/83855284615.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137fcd553f18---nunujatox.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/rulebitudogebiwifezibi.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/musejiwiguwi.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_off0000c8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EF 10384 bytes
SHA-256: 6c3383627d958e0969c172ec999442c5fa2af6fd4bd58a11a13101805686cb2a
font_02_sfnt_off0000f84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84F 16684 bytes
SHA-256: acb9567f9a496407110dc843d41b2685f8d72e6f8de6312ed7bb66cf0ca4031e

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