Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8030a2682b5223b…

MALICIOUS

PDF

76.1 KB Created: 2021-09-17 03:19:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 68a23642307e36eb2c16930784d96b2a SHA-1: 8eb917306c15de8b0061cebab110ac2b211fe36c SHA-256: a8030a2682b5223ba5947804c5079ddcd69add4aa72cb438a8d467c69b8d66ad
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to domains associated with compromised content management systems or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://baovevietnam-vnss.com/upload/file/wokowuvugomumalam.pdf In PDF document text
    • https://dancleland.com/img/upload/file/xivabos.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/8464560816.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/4525507306.pdfIn PDF document text
    • http://vejwun.cz/images/dinivibumiwivezitilo.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/vivusifusakunuvukikuviru.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/wotepogutolij.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613629d5e0197---76284402915.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/12223372466.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/23743386079.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320fc968c5a---15412167629.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/65555894657.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1614170a0d8ba1---vuteselebulubavajoxag.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/vutivon.pdfIn PDF document text
    • http://jawarakreasi.com/file/26048941734.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/20554154321.pdfIn PDF document text
    • http://szpk.hu/_user/file/welapowowubo.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/m34jnmgvuf6pqio03ojnt4d7ga/bewajewita.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/vuduj.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/24952802105.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/61399789369.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/20235457311.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/87008220779.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/xuwotavarujumolu.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/vasabetubexatejasagojud.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/76416998575.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+unlock+pattern+lock+in+android+if+forgottenPDF 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_off0000c45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC45F 17352 bytes
SHA-256: 3b6f394d8777234a9acba4093f8894cc602e46e29ea78f4afe4a3ccc118edb74
font_01_sfnt_off0000f0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F7 10896 bytes
SHA-256: d0d7f9e47fc30fa87d97b765737ae3429561d32ed16fe9722bab4a03a87ed5b7
font_02_sfnt_off00010a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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