Malicious PDF — malware analysis report

Static analysis result for SHA-256 05bcb56c411668ec…

MALICIOUS

PDF

88.8 KB Created: 2021-09-04 21:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a8b8c58cfcac3a9903896bf6eda6609d SHA-1: ef01f3e290d54be873be66c1d79933e3091fdcaf SHA-256: 05bcb56c411668ec8bef705623aecfd4faf002e1992c961aed157207746eb818
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b42b32c8c58---64633515256.pdf In PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/b74729ba2ab09e5ea2c2d97db7838de4/52109830315.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/69c43ff80e83fb8dc15081c2e40d435b/34964753221.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/e68c5c3eb5603df2151f6850d0053b82/wukiwotosati.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/20057011021.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4e913c1ee---bipamuk.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d12f3d165f---kipojemilobitutovafireka.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba3d93feee---12480959534.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/gulite.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/giwufadowebafigeguteferoz.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/84309877482.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/musikuwoso.pdfIn PDF document text
    • http://babamoleskine.com/files/file/86643533215.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/febefiweg.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca2aef2779---gowone.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609db7118d0ab---sesuwuwisavujawuzifele.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/44747232684.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/savimipumelofujomazumol.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/39206967536.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/jekoru.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d96f252ac---91583152384.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/difovoputozarefewarutaf.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/sefogegoguxodesabaj.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/11136278428.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=worcester+24cdi+boiler+instruction+manualPDF 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_off0000f431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF431 18236 bytes
SHA-256: 710e68618eef8ec879b8bb13bf6627ab72a5194f4ea97d493aed3268ef9f7c61
font_01_sfnt_off000123db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DB 10960 bytes
SHA-256: 2770908ca8a34922f4fc642fe43679d888b4a6715ed4037d555a42c2f793d0a4
font_02_sfnt_off00013d5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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