Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a103afec95583f4…

MALICIOUS

PDF

76.0 KB Created: 2021-06-30 05:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0876edf983a6a98f36562a9ba7e073b2 SHA-1: 5328c404d4c85aab3232c38ad8c7d83fbcf701ed SHA-256: 4a103afec95583f4dd2f7c963abe91583f72b4988c5092dc34351606ccde9c15
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing attempt. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://medvor.ru/uplcv?utm_term=how+to+make+tungsten+astroneer PDF link annotation
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/volifonepof.pdfIn PDF document text
    • http://sam-global.info/files/file/kaxopitatalaxudojif.pdfIn PDF document text
    • https://pabrikangka.com/contents//files/83397635221.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/9653368283.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/gapuvutotido.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2106231232250444228nu6si.pdfIn PDF document text
    • http://allasclub.com/campannas/file/23692149646.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/83399456217.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1609a08e1a374d---xolumutof.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/jefexixenuxote.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/5c4927064239f35de981cbc03eb546ef/82570084355.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/sikopin.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/sefixupulufibitekimuvize.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/ab320e1400c5c958b57ff98eac41904e/kibazurunodi.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8b0b78ff1---rapupugewezudido.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c84dd81a38c---sufabikasunotox.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/72228910090.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/35570682457.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/xafixakebufifot.pdfIn PDF document text
    • https://bamor.org/userfiles/file/14544004388.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c60c5ce8149---menegaparuwonozal.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_off0000c4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD06 17060 bytes
SHA-256: 05da4daa38d69540d0fc25ed1301b944298afac39ce43badaa23999576740698
font_02_sfnt_off0001094f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094F 10580 bytes
SHA-256: 37c1f6552bec165b978402047e6f351623c382e7bdfdf178d5a3111977deb154