Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8d01a63ab5c5567…

MALICIOUS

PDF

69.4 KB Created: 2021-09-25 10:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6c9c5e5dff7af0b87fc533f8af5ed7e0 SHA-1: 49ecba34fba833a244b24b0d40c06c3caea4701b SHA-256: e8d01a63ab5c5567f34b458193722d65e32b8c26c177449fddea7f54213c4ee5
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. Heuristics suggest this is a phishing or malicious PDF, with ClamAV specifically identifying it as 'Pdf.Phishing.Trojan'. The ML classifier also strongly flagged it as malicious. The file's purpose appears to be to lure users to external sites, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://gsemilia.it/userfiles/files/23810556702.pdf In PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/wumumusoduzunusizusofaxin.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/33599405182.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/foguruz.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/xovubibaredagagonefoju.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/lamafego.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/79877403691.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614cd4a4de12f---romodozurele.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/17986341673.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16148dab238f0d---14426000702.pdfIn PDF document text
    • https://solturism.ro/images/file/24762125735.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145a6de0884a---wetotizokijukisewu.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/56f9jdeg5d72mvf25r4f0ralf4/61947228598.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/nuwigexesuwezu.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210909160346258.pdfIn PDF document text
    • https://yensaovinastar.com/media/files/27043729173.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/1123147827614e526b81c8e.pdfIn PDF document text
    • https://majubesar.com/contents/files/gaweduwusu.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/kojexezezuvadinibedunolu.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/92689456090.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/lulujiwukapoxuwikolumu.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/saxarogib.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/luvimezere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=my+darling+arrow+read+onlinePDF 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_off0000af5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF5F 10352 bytes
SHA-256: c102ab6aa7ebe6cedce3afe49c227f80bc205c1119a1c1d9f200e1558af4bb6e
font_01_sfnt_off0000c698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC698 16312 bytes
SHA-256: 906bcb32952b129fe3290b049a5d5a74af1714f66c0163e875001f465f8b0f0c
font_02_sfnt_off0000eff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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