Malicious PDF — malware analysis report

Static analysis result for SHA-256 166c80010d2d60d4…

MALICIOUS

PDF

87.8 KB Created: 2021-06-10 15:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: b82af069dee48e05abfa6a66dd01eac3 SHA-1: 62179a6b3cbc2e2d24b3dcb6505105f914712366 SHA-256: 166c80010d2d60d420c62cc96f7b730d36fe36e57d668d9c787c246d92127b1b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites and disposable hosting. The presence of these links suggests the document is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://smidgel.ru/uplcv?utm_term=digital+world+evolution+android PDF link annotation
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/b0977218d67133ec020a110994f7f52a/12093735164.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/2ea77215800ddec0bc69b4232f9e1f1e/gufoj.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/e71ugjdc61bikap9665qo88gb1/13216301030.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/79155265951.pdfIn PDF document text
    • https://plasy.com/uploads/file/fadigugavunowavo.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/68820559338.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29a43dcfbd---27133333581.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607129db19fee---tamanazuwakufutow.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ce55f0b8d---6111540323.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a25f58e2d2f---bogukixal.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/844c7ee3788b48d93d847d58e15d8887/79352375922.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210608_0F4AF35827B616BE.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16070690729c82---mopogilakiwovitanopibedu.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/cbml98purlmcici1kl82nfmjq0/lebopelebe.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160780c56e2e27---rotemipefudavu.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/ae54f62179cbec630106935318fa8927/rupunewonanidovusogovawek.pdfIn PDF document text
    • http://gtshotel.it/images/file/16867660884.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a7c1296e6---meruli.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0000f331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF331 4964 bytes
SHA-256: 3bad02e1de392fe08f8e67033f6613c508c422a3fa6844d92e98feb1a961ba54
font_01_sfnt_off00010435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10435 2696 bytes
SHA-256: 68778fcd55ab51f3fcc92fd0ff8e6fbcb58f9c846348c1fe4762980df5609fee
font_02_sfnt_off00010f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4A 11828 bytes
SHA-256: a5b2cc256da456f364fde57f715a0a8f26275020d8c10089a38645a665516d77
font_03_sfnt_off00013678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13678 17112 bytes
SHA-256: 436829979245b7126098886beec731c3e32f79caaa22165f5cf5bd484c81a714

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