Malicious PDF — malware analysis report

Static analysis result for SHA-256 b35eb1094f573539…

MALICIOUS

PDF

72.8 KB Created: 2021-09-17 14:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e999d1648fcdc458a5641f83db780eae SHA-1: bd6f656d9c9764699ffc2c1490dde6b22f4b2d5b SHA-256: b35eb1094f57353967b99ee6fdb884d48af72f09508da817f3e2c423dba9c140
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to numerous external URLs, many of which are hosted on potentially compromised or disposable domains, suggesting an attempt to obscure the final destination or evade detection. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/kigemala.pdf In PDF document text
    • http://sklepjola.pl/userfiles/file/jaxuzadurejerisafitata.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/77072026211.pdfIn PDF document text
    • http://fmdscu.net/userfiles/file/jedepikik.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/79764060331.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/15123151939.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/13821997734.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/24423472619.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f02cd71d7d---kazimimepemakulubajali.pdfIn PDF document text
    • https://www.algeos.com/js/ckfinder/userfiles/files/34344723833.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/90507625054.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/visumolunupuxumovatoti.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133bf8c876d8---rotupo.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/161388df53bc85---dipasubidiletizaturilosel.pdfIn PDF document text
    • http://ducthanhtam.com/uploads/userfiles/file/nobosetimaredulujav.pdfIn PDF document text
    • http://imhang.com/fckeditor/userfiles/image/bubotekigaginixojag.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/julatizipolemorariware.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae4b15ddb6---widotabinugo.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/xujumo.pdfIn PDF document text
    • https://salonrewards.ca/images/file/94956285293.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/lasitolona.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/fikabinojogalivuko.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/b7da3925904903446fee16e320ffe8b0/43577498974.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/puburudumu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=torrents+for+android+moviesPDF 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_off0000b8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DD 10496 bytes
SHA-256: a9320da8b31ed0b07df69142d426a5cc7d2a5c25c4e463307b577572e2bf3d77
font_02_sfnt_off0000e8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C0 17552 bytes
SHA-256: c2c0d5109b943a1c585bb1efac0f529a7c126b7c264a5d5fc0e2c6dd3c16d5e5

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