Malicious PDF — malware analysis report

Static analysis result for SHA-256 62d4aac62efecc3f…

MALICIOUS

PDF

85.2 KB Created: 2021-07-16 20:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d4c64a4ca8d8d84424f07808a4f4868 SHA-1: ed5e66414c0f8cc360578fa978b59a52264f6075 SHA-256: 62d4aac62efecc3f8199d03c673fdf0416c45879bec52f3808420f87c937d34e
204 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and numerous links pointing to potentially malicious PDF files hosted on compromised WordPress sites and disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload or conduct phishing. The embedded JavaScript is likely responsible for initiating the download or redirection to these malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://seitonsolutions.com/ci/files/fowapufitonenedu.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ee2c298ed6c---75030014884.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/02qnstu8ap4k1bh89asv56e5o1/73694366204.pdf
    • http://aviapartner.biz/js/ckfinder/userfiles/files/36780147437.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/a9e78a6b1fd51674ec32c055c3bc9bd2/31886451166.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f99d2aee4---36159149789.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071e1947ff39---74254665640.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/qfr9sqjth751cj8aiagqgu9olm/16507104844.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/o70ccsjs22h92mufv35l5ainpr/zipadonatilemobaxok.pdf
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/76588219642.pdf
    • http://yaqeen-eg.com/userfiles/file/tegovifegozizuzotaveva.pdf
    • http://sunnysidehigh65.com/clients/d/d0/d00d1ad1640c45b888f5e58ac216a5d1/File/melebupukupuseremi.pdf
    • http://vstarmp.cn/upload/files/20210616_072232.pdf
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/dakonef.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967e76e19cd---pilifofuduzowajapowaju.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9270ea7ed---91969963981.pdf
    • https://vanphongphampmc.com/upload/files/gozixikeve.pdf
    • http://mateuszkucharski.pl/admin/file/xumixoviloxopizafagax.pdf
    • https://mayxaydungthienlong.com/uploads/files/files/72253291103.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cee96f188b4---sotibuloribufif.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/11205380564.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=area+of+plane+shapes
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec95.bin
c6de145a0b23bf6e79c38a4f77b5440c56bcf0f35c3b0e94e2351d9a794b023c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC95 16944 bytes
font_01_sfnt_off000118c8.bin
e873d628a009c429c1011543a258f13ccddde23a2274d8e73813923f79fe24d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118C8 10244 bytes
font_02_sfnt_off00012fbd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBD 16792 bytes

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