Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a5ad1a76e60c1ad…

MALICIOUS

PDF

78.8 KB Created: 2021-09-23 00:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ea2658555e8bde5351f9afaf78ebff8a SHA-1: b2372cb5967030cd7ec4bed362ddf0ec652f11fc SHA-256: 4a5ad1a76e60c1ad2e74541089c3970cbcc4719af5b3b7a6a43e41da19965b9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Several extracted URLs point to compromised CMS upload directories, suggesting an attempt to lure users to malicious content or phishing sites. The document body is unreadable, but the presence of numerous links and the 'link farm' heuristic strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://prospr.fr/ckfinder/userfiles/files/10797399400.pdf In PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/50495882704.pdfIn PDF document text
    • http://sapthagireesyathra.srikarpagavinayagamills.com/userfiles/file/70517899368.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/vibanatefarosepinilaluz.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/sukosepokuvuxojosufawogu.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/vezekowetuvamemefebogan.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/57795169573.pdfIn PDF document text
    • https://satesayap.com/contents/files/kapufetidazu.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/be663e7ec7bd206ecf2fcea95ca41225/nirojuvulufo.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/pibesezuvikubo.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/76835217124.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/baduku.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/52219925075.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/48417199562.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/fegenaxuzora.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/20314485019.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/tixurapimasafisasutix.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a3d42eabdb---vabigenuvawiwunugu.pdfIn PDF document text
    • http://gptools.net/userfiles/file/lawinomizerenaro.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/mamuluva.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/2a2e1ad62644426ed90abdcc4b679f27/bifemarigukalizeved.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/64401603782.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/27346839143.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/66044307438.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=7+letter+words+starting+with+shPDF 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_off0000d3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCE 10568 bytes
SHA-256: 6e95806c329da256680d991d9ece280d75f155625ec73cd2b6a4665664aa61a8
font_02_sfnt_off000103b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B3 16460 bytes
SHA-256: 7081d13d2179eb988ecd9966432814dd6089c0c2b9731a5eb5c40aa3ddacf044

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