Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d2e156f6ba5f332…

MALICIOUS

PDF

84.3 KB Created: 2021-09-03 09:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d2e36fb13189ebe7dd306d8a37f686d4 SHA-1: 5c645f3788ab3bf23eb5a1c26974d961d4524ce8 SHA-256: 5d2e156f6ba5f33262bf1be882de06ad64b3911fe778afc9fb144953de6a9392
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites hosting further PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing lure or download a second-stage payload. The embedded JavaScript is likely responsible for initiating the download or redirection process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16093d3bdb22ea---34147775430.pdf In PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbb648b1a5---32810371386.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/wakotokos.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/kujodut.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050505144640.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c14a4b6b6be---50630457664.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/3607237261.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/zagowivurar.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b09f0613555---nerigi.pdfIn PDF document text
    • http://teaneckhs1977.com/clients/67867/File/kuxumarakagujasanasuleru.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e8d2b0a14d0---32697049584.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ea62006681---68257724081.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/sodulujekalajogog.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/70403c0bce46cb5dd1b014df01a6d466/74757945986.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/galazosasitaxizewudof.pdfIn PDF document text
    • http://aquatrustfina.com/userfiles/file/rabaxusasigapesejotu.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f2df8091cf2e61fe6f738fe18bf63a21/neruwuf.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/23216131717.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/gotabatori.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adab546306a---97983158309.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/57247723050.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/plfihh3t0e77d3fkfm2o0n7j3u/75918673686.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/jilimimijomixelu.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/27568028816.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=pl+sql+developer+resume+2+years+experience+pdfPDF 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_off0000e2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C9 17656 bytes
SHA-256: 98167a0b8dce0bfb226ccefe2c511ed388329bf87a00b427a26e7d1e46a9982e
font_01_sfnt_off000110e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FE 11332 bytes
SHA-256: 7c65123691c8c966c515cea01eca70f8f5da4a37524bc4c6ef8ce4d158370e0a