Malicious PDF — malware analysis report

Static analysis result for SHA-256 16503cb3b3b352d6…

MALICIOUS

PDF

85.7 KB Created: 2021-09-19 06:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e0e6c6d5dc62b5b41182667981f7478b SHA-1: 6764a2f5059cbe476e221e1774d6011d37752ed2 SHA-256: 16503cb3b3b352d6db7b9c09d3a1727a4dffb3587d19abcbc26bf6ea8a15e595
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are hosted on compromised or disposable domains, forming a link farm. This suggests the document is designed to redirect users to malicious content, likely for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://helloslow.com/data/userfiles/files/davozamixerekixafap.pdf In PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/83696904648.pdfIn PDF document text
    • http://mweb.cz/images/file/bujasa.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/56330016592.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/74403613703.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/87379255412.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/jumowarudedirifufe.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/35955805466.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/0b10a4f724462c34aee6e03fb29d92b8/dusabutizavexowijuz.pdfIn PDF document text
    • http://dominant.name/userfiles/file/wuwexatirudabepipam.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/luvogabuguvejutipukadewis.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1c0ad7633---xunuzezimo.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141427de4c7d---13063077917.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/48541483148.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/fexibigobireteladu.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/83163448382.pdfIn PDF document text
    • http://keyday.ru/files/files/19110698950.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/dafifeli.pdfIn PDF document text
    • https://seas2010.cienciaevida.pt/site/upload/file/fozovuxovis.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/sisatopefexilemabaze.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/67579019032.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/66107837313.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/juwexeluvebumupudufolili.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/80843114283.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=neutrino+app+androidPDF 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_off0000ec48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC48 17448 bytes
SHA-256: 0bb243eb9e0a7f2715ff21136dee9d2ee4475eb873c54d785e6de76fb338944f
font_01_sfnt_off0001199a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B1 10248 bytes
SHA-256: ed6d7be557a2a8245d20a7e9a7cf52ae882d0cf886a862462387e780609c206e

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