Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ba4aa6d0adf7026…

MALICIOUS

PDF

76.7 KB Created: 2021-08-16 23:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d75cb9ebc79a8136ba7ddf3a5bcad674 SHA-1: 9dbf9466d3484ce30c8e754c186948ef77af2783 SHA-256: 5ba4aa6d0adf702664d80e80c125bb5e8cd9623f1a4b7132d8b7ead6ff9958c3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious payloads or redirecting users to malicious websites. Several heuristics indicate the PDF is part of a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/sefavifapifitajiwozax.pdf In PDF document text
    • http://adamlegal.com/userfiles/file/60594908210.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/wowoluverejeparenokunibe.pdfIn PDF document text
    • http://sharise.net/Uploadfiles/files/856049963.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/11262338182.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160e89aa8700d3---22267886893.pdfIn PDF document text
    • http://sinoorchids.com/image/file/30572310585.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/dojibikugadojezimevitidu.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/renokevavamilo.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/roreduwikexokab.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ca120d795---dixigimumuzixesifofu.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/55de9f9b1c28b32057cb596c135952fe/92503761460.pdfIn PDF document text
    • https://landbar.com/upload/files/84191696988.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/lesenuzomazir.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090567d62a87---14728509168.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/fogixolugonuxosaru.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/63036527272.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757a17f3ae4---7251226103.pdfIn PDF document text
    • https://hgb.se/filer/file/37832923528.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608d298e27adf---fepesanifeje.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609618590eefa---rimimokitisikomumu.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/mavavaravajazufuxo.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210601_24664E6FB79B9B43.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=low+a+baritone+sax+finger+chartPDF 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_off0000c818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC818 16164 bytes
SHA-256: b10d6b711dec6d10a7a77f1c1af9c67cf43ebfc0a358a662e695e6f6a3207126
font_01_sfnt_off0000f1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BB 10856 bytes
SHA-256: e9bc883eaba22062dbcd8218b1eb942837e17c915803f44cb9130ceef9e04146
font_02_sfnt_off00010ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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