Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad533c72d2f81cba…

MALICIOUS

PDF

79.3 KB Created: 2021-09-23 14:16:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0ed5453713ad7ecbc1bd2d05a4ab5687 SHA-1: 67805d0c4e8aee1c9d14d1ae583556baa0fa02c6 SHA-256: ad533c72d2f81cba25d50b68f2d7d4e341e2f8bf8174a649de47064feeb63d9b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common method for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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 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://grandwatergatehotel.com/upfile_hotel/files/vamoj.pdf In PDF document text
    • http://89928386.com/uploads/files/202109211544516422.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109012200412016.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/54978391944.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/83155742886.pdfIn PDF document text
    • http://showdoimovel.com/files/files/givotar.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/lofixixixoxadetarotefato.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/zudetadili.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/81328882190.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/kigikofufakabisagadegu.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/wuzewuv.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/files/91711706493.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161392376286ea---fisaxotowilezifonawe.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412393cb724---78485362646.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/jujujoxilepexazu.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/rewojazovedinakojamunevom.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/jegiviwib.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/wesewaserukufetokalolome.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/digajuwazefanukilupitap.pdfIn PDF document text
    • http://hansungid.com/userfiles/file/dovared.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/85969c14058fa8f7d493c7e0911befcb/limifuxile.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/rojinarutikadu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+recover+deleted+photos+from+internal+storage+of+android+phonePDF 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_off0000d05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05F 17324 bytes
SHA-256: 41855ea828407498a8da593e4f73760cdbf007b1370d0c50c4256a46296db40e
font_01_sfnt_off0000fd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD00 11208 bytes
SHA-256: 618b990abd0a7ccf2172286eeff219aca9b9d095ee35e2ac56fb9b54432c0c48
font_02_sfnt_off000116dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1