Malicious PDF — malware analysis report

Static analysis result for SHA-256 fde51cb0a8a56456…

MALICIOUS

PDF

81.1 KB Created: 2021-09-14 08:32:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9b0891d991b67d544ad1d36480c81c8f SHA-1: ffcdbadad58242e3b84b431d33e0c04b1021bb37 SHA-256: fde51cb0a8a5645636f3d60d61bab9aa5dadd0efe16fcc865c0807e0ff2cab87
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of techniques used to exploit vulnerabilities or trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/libewoposokojupupoda.pdf In PDF document text
    • http://ekhoron21.mn/uploads/files/10304099632.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210913162742.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/79315333474.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/peliridamifinusokaro.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/rasuzifasogafimojofegevol.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/tewuragofuwaraf.pdfIn PDF document text
    • http://rayer.cn/d/files/33672769762.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/66898556927.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4238d5ecc---79251099251.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210908051655.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bofudazepavaxegerufiji.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/niwulizuju.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fd28604cd---85630161104.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/48515678837.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/gabiwisamivi.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/fuzijoworake.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/wawarujedika.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/89749791289.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/nazuzuzasomudadupadut.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/21163466698.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/l80144deia5uehg3qeb8omueo1/fofijisusufawanuriw.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/d5ahm6t1qq6euqelp303aitgvm/59098882693.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/30097558942.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=gta+san+andreas+save+files+100+complete+free+download+pcPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD819 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02B 17120 bytes
SHA-256: 51a17d763d7eadeca35bbd8a0f1e2aa18549e3713d4fdd1980fe43daba618c93
font_02_sfnt_off00011cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB7 11144 bytes
SHA-256: fcb543cb7fa999e6c8077212cec807bd836e0187ea1157460d99be6ecbedc484

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