Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e16780046cb25e3…

MALICIOUS

PDF

86.8 KB Created: 2021-09-18 05:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 72715516c275d9eeccf9eaf1dc5aeda2 SHA-1: c8ed3c0936b5d96717a7c9a22f00074a04803ff4 SHA-256: 6e16780046cb25e3ac43f50402983066ba5b7074be902b41421c4a2d7f89457e
156 Risk Score

Malware Insights

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

The file is a PDF that contains a link farm, with many URLs pointing to disposable hosting or compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and a link farm structure suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://smidgel.ru/uplcv?utm_term=bonk+2+io PDF link annotation
    • http://mebelhotel.ru/images/news/file/goxuzuwodigewibuwusawob.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-13/20210913163702683253.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/kutifopuwuret.pdfIn PDF document text
    • http://erago.cidees.com/uploads/files/kelapegewugotume.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/js71kso5kgp7ccac1sb4vl2etd/nagamarumaj.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/xonolod.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/26522326422.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/59551548192.pdfIn PDF document text
    • http://dominant.name/userfiles/file/jalimupisesabopezujuxug.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/remaruwuw.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/79255030492.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/5a77c367a5fc7483eb655ef54877853f/wetavenijutaw.pdfIn PDF document text
    • http://dejede.com/userfiles/file/5617507662.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/61642325861.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/6575839849.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/93a055a2bed8a20e9f88a67399101ae3/nezorerimujudato.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/jiluri.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/35060965161.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ki6dqqas7uesi64vluq4m75g10/donikekupefogajuze.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414dbd5e858---soxobaj.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/zetomoxaranubijewinukume.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-11/20210911164251137197.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/zudowap.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF240 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A52 18048 bytes
SHA-256: 763571fa4ca1f3d00ea14e3aae2bae461f5b9a97fcac0975e253c8b9f3f0ebb3
font_02_sfnt_off00013945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13945 9660 bytes
SHA-256: eab9690824f348cb9070321f224f88d92517f04879475ca43e91cd0b84094a7e

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