Malicious PDF — malware analysis report

Static analysis result for SHA-256 b82443857d26e285…

MALICIOUS

PDF

72.9 KB Created: 2021-09-01 02:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b44220b709175ead748b1e1d7390ac86 SHA-1: 8bd04d80c26f3d3f027b38d681a1bb26b2f5841d SHA-256: b82443857d26e285927c1eb940d6d0bbb982daabef8effc7c2fdbd0f4a8e02a7
164 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver further malicious content via the linked PDFs. The embedded JavaScript is likely used to obfuscate the links or perform additional malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://xlsferrosilicon.com/d/files/44070325168.pdf In PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c92aca4b29c---zasazejijawavi.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/12803164849.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b851e2b2017---76423914955.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093af6b6267e---katogebazurow.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/zivapaxuxoxoxuravelono.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/gptul6p7vdce6sdedbpglqklp6/xibewakukujovewuxovovisox.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2323d52940---tixegan.pdfIn PDF document text
    • https://airbays.com/userfiles/file/91863589912.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/41286630067.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/melemodapugav.pdfIn PDF document text
    • https://www.aeap.com.br/ckfinder/userfiles/files/gimovakubixuwumu.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/15016327029.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/1413949911.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/45847273152.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210822080015170.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35740d2088---kigadir.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/nexasibinutiv.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711fe713997---68679972965.pdfIn PDF document text
    • http://asustainable.com/global/file/xumopopinakemugejanapuse.pdfIn PDF document text
    • http://108homed.com/userfiles/files/gifilegese.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/250d027167ac92d86e108068c95b2eb5/34454280698.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/66185186994.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=making+scones+in+a+food+mixerPDF 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_off0000bd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD60 10860 bytes
SHA-256: 02a6ad75146043dca7a69749e9088c77e5738a811591ab9693f5610777dfe3db
font_01_sfnt_off0000d642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD642 15300 bytes
SHA-256: e31cd141c9f6e7714fba11161e1f4f7d00dc7ee049fd6019ff5ee5966f29f6ae
font_02_sfnt_off0000fd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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