Malicious PDF — malware analysis report

Static analysis result for SHA-256 f01010c252a0b29b…

MALICIOUS

PDF

81.8 KB Created: 2021-09-18 18:17:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1a3d9a2c66d185558eb6099c6d83ce4b SHA-1: 9c3954a22b163b31fc8c8d00e5eb3be7fe5dbd7f SHA-256: f01010c252a0b29bbbd6793d20c6691f89f5e97a9cf7b291672b03f80063058b
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 websites or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://catamma.ru/uplcv?utm_term=man+from+mars+and+female+from+venus+pdf PDF link annotation
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/55884023245.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346b9dd6145---17857862357.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/sotovan.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/tebod.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/97101204153.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/5ae3a1056c45e0d6b5a6aea7c509f8c5/latubadupape.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/28037681392.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40610107837.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/kuxuruvawi.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/tidatipu.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/80588388399.pdfIn PDF document text
    • http://coolbiotech.com/upload/files/45326946911.pdfIn PDF document text
    • http://friulanapanini.com/images/file/bonalojudopizu.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/25265493862.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/38863887992.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/sibudufigobopijiziralisul.pdfIn PDF document text
    • https://linardi.ru/files/file/giborugekokipav.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/naveburulum.pdfIn PDF document text
    • https://riwg.in/userfiles/file/zigusosuzimibenar.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcdb530eff---99220789089.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/vaxuzezagefupofarol.pdfIn PDF document text
    • http://jcpingie.be/public/files/zofuxarefagatoni.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/simawosawanajedumazase.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/fepasujuxedetar.pdfIn PDF document text
    • https://tavio.ru/files/file/jemiwexubovid.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140ee457e3ae---someb.pdfIn PDF document text
    • 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_off0000dc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF466 10628 bytes
SHA-256: 5690ddd05db965fc3e384551bbdee0f4f13b538f6dd3ac2e7e05b8abf724c397
font_02_sfnt_off00010cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB0 17444 bytes
SHA-256: 4aee2880fd8d583ee162a399ae890666ae7d510c95519328d22ee8ac7f9f2b53

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