Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b8b899ce9d07e48…

MALICIOUS

PDF

89.5 KB Created: 2021-08-10 02:30:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e950334711ffeec8902f00061bf099f6 SHA-1: aa4cfa19dc8b7f6a5d58d7251dba1758b9a8031d SHA-256: 3b8b899ce9d07e48e9cb7ea5167734e0793dc8ee00b78d3fb383b45b7471f16a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Numerous heuristics identified the document as a link farm, with many embedded URLs pointing to compromised WordPress sites. The document body is heavily obfuscated and unreadable, suggesting it serves primarily as a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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.
  • 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.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceea74b0302---ganunolobupiguruvoza.pdf In PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/emlq205ktvjmi77emjco6dhac7/12211547664.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7d97ac537---63252701870.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/3adebc824f951a9b6af00292a3c49848/torivurujinotiwofemi.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/67566817986.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/9uiehpl0u1t7mvpgc6fei14t7f/20721400309.pdfIn PDF document text
    • https://sanidom.pl/img/file/rujobiwawajufuri.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd698836d0---3640223139.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/bdb5394e28c9ad007cfb25258eed8272/11188692834.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8a9febdca---40507424427.pdfIn PDF document text
    • https://asiahijau.com/contents//files/dopipoxobekiw.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/a02c8b6b11293ef466faa639de56b706/pilepamolugeju.pdfIn PDF document text
    • http://hasyo.net/files/file/19027789487.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/c88f7a27518705bbc4bd5c2c2163af4f/19549034254.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/wusufitapadoju.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/voxekilugobevosenu.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/jakupi.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/d00fc2839b94298795d2d47d1ebb472b/27108640325.pdfIn PDF document text
    • https://kawanmto.com/contents//files/butosabapiwanowofutu.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/78681224887.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/95756300669.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874046a464b---45784534552.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/bimafemivawonikevifabegot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=letter+to+request+early+release+from+probationPDF 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_off0000fada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADA 16572 bytes
SHA-256: 39043ebd7e78d92f501cd8608a12bb6c39fa5cd4187f00462558144ebdc01ccc
font_01_sfnt_off000125e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E9 10976 bytes
SHA-256: 05606b6a7ac6f55885922dfa613559753e733b7083c80ba43110ba21771fd12a
font_02_sfnt_off00013f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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