Malicious PDF — malware analysis report

Static analysis result for SHA-256 b430a5809a450b9b…

MALICIOUS

PDF

69.5 KB Created: 2021-09-19 08:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 13a7b88c68c786f5a5ba0f3b315c1aac SHA-1: 625ca841367e0bf2aeea15eb071ac079ee8b986d SHA-256: b430a5809a450b9b18da0af34902cf2582cf3353e7da823a3105ac935eca4e31
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous external URIs pointing to various domains, including compromised CMS uploads and disposable hosting. The presence of multiple links on potentially compromised or disposable domains suggests an attempt to lure users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.taxivanclass.com/uploads/ckfinder/files/83981331132.pdf In PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/jonatukupoz.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/43826149835.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/zijojarelaralumadisi.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/vukuxobaxikisi.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/nixojozin.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/papegujinepatifokuzo.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/mojake.pdfIn PDF document text
    • https://guijek.com/userfiles/file/16378732472.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/kagefakoxopovagurev.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210903_58C0800C794A03B0.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/ximudepegosaxisusezufafu.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210913155501.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/lediresomowi.pdfIn PDF document text
    • http://dgkno.cn/upload/rinuwuvi.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/81289407544.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349533d1f4e---9387990478.pdfIn PDF document text
    • http://yoron.net/up/files/xupunijutuwute.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f9fc10e8e---zaleloxuka.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/78518580907.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/jeloditepuwukaxamosomimu.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109172230592735.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/dixerud.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f463010874---53555845878.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=dna+triplet+codonPDF 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_off0000b3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F2 10340 bytes
SHA-256: a2523c984d38bf828cc5d7a7edcb3a377776796e0bf641f4444f5f32bd87c699
font_01_sfnt_off0000cb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36E 14808 bytes
SHA-256: aad33697b7690912cc81856746a108668481f91d5f57d1545ac1f5f8dc84a6fc