Malicious PDF — malware analysis report

Static analysis result for SHA-256 e421b287f0717bd8…

MALICIOUS

PDF

72.8 KB Created: 2021-09-25 11:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a80fb29b82588348b3fdc13c9e528062 SHA-1: daecc12aa287cfb31326b955c7ace6f0c3fd07ff SHA-256: e421b287f0717bd8e6ab41248d425feae8ff7cb3344f1d8003a10ded2d427407
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also features a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious files or redirect users to phishing sites. The presence of embedded JavaScript and external links indicates a multi-stage attack, likely involving the download of further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133111074c99---lokusuniladipi.pdf In PDF document text
    • https://datajournonepal.org/files/98239924515.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/71771066702.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/marutoxidodasetubi.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/lupekexej.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/vudaxoxes.pdfIn PDF document text
    • http://halmar.info/userfiles/file/pewujivuwar.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/dizolijodafijajefejux.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613be00a8b876---wugazoxuduzawatepewo.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/50858762629.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/80140011626.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/64313741303.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/7078940666.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/lusekeduxunotezum.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/38417993857.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/bobepomapup.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/91392761388.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/xetavinamewakajavojerid.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/82821885619.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/sesowelemadusirodiz.pdfIn PDF document text
    • https://bem-sa.com/img/file/viropubogomapobagaf.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/fewuwazizuwu.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/jifavot.pdfIn PDF document text
    • https://digireg.it/upload/16012860059.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/86988527525.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614125dd89827---dewesogarolulazeremoriv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=du+recorder+for+downloadPDF 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_off0000b5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E0 18636 bytes
SHA-256: fba2ba9399c39585ab2c71b4df29e4b2d3357ac94ca1f302a6c262b9fbec7ac8
font_01_sfnt_off0000e64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64E 10300 bytes
SHA-256: 434803ce6e9f71bf65d384fcadec4e9daa2452d81053f5c016d65a80bd02a8f6
font_02_sfnt_off0000fdb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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