Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fdfa41de90a2a29…

MALICIOUS

PDF

84.9 KB Created: 2021-09-02 10:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f36742405820b5aaffd7c49b83e2d4ce SHA-1: a8c25bb12e28a8a3fcc24b77027134e9220e61e5 SHA-256: 1fdfa41de90a2a29b4a2fa45f037d3bd74f3d86df05251c46f0c6da6113e3a46
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF was flagged by ClamAV as a phishing trojan and a machine learning model indicated a high probability of maliciousness. The SE_CLICKFIX heuristic suggests the document attempts to trick the user into executing a command, likely to download and run a second-stage payload. Multiple URLs hosted on compromised WordPress sites were extracted, indicating a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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 http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161260f212a139---foxikaxomonawaxanezukex.pdf In PDF document text
    • http://lungshingcentre.com/userfiles/mosupoxelomejivenovodetax.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756b95761ef---dabukuv.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be4c6b4c3e8.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f7d00f2af7a---4942551026.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098e23c38c8a---dejaloripeki.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c39ad17bd5e---dewab.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/34095904283.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/luputodikimemut.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/3pc3h8ja6ql99mgmv53e5htf0c/39484474545.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc804618bd---14983496509.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802e7fc589c---femajuwizininixugizusa.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/2045879505.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/gokifudatulo.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/jubuzilorivoredovudapof.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161037afa4c394---wojamovubul.pdfIn PDF document text
    • http://samtekelektrik.com/files/pedirixotuzetivisu.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/cd9b9f00a16714f3a2ca58fa72bec903/ketezuregalutum.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/529f2593a989a7295fa356df5521bb72/2544353226.pdfIn PDF document text
    • http://fittbike.hu/files/file/73731255400.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/peloxukex.pdfIn PDF document text
    • http://vodova51-53.cz/files/65516062172.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/pawuginukororawat.pdfIn PDF document text
    • http://maisondequartierdespareuses.com/userfiles/file/gonuduletakive.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/sabine.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=office+365+loading+profile+stuckPDF 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_off0000e4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FD 17764 bytes
SHA-256: d35d8e179fa4000b1d1824d4ee6aaf5dd592d98188eb4e3e1f8937b196e3a633
font_01_sfnt_off000112b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B4 11488 bytes
SHA-256: 88fbc3e6616a6abd4a304f4614704d9f7b75d44a8e1d84a5950a8338dcf0bd4d
font_02_sfnt_off00012dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1