Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bd538ee914300a7…

MALICIOUS

PDF

90.8 KB Created: 2021-07-10 05:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a2184ef3cf231132096245afd60f508 SHA-1: dea6e9e924d85f047438b849fd2daac501b9fe0c SHA-256: 1bd538ee914300a761fc650db8091392e5654a7ad1930bb59d269eb015f2e244
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links to various websites, many of which are identified as compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download further malware or engage in phishing. The primary attack pattern involves directing users to external, compromised resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8c0d4ca6e---2083635241.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/9cd71c03ef9032e01d63522a407793e1/xadedakanujuti.pdf
    • http://globeksa.com/ckfinder/userfiles/files/9278016079.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffbdca672e---11771462348.pdf
    • http://ongnuocdenhat.com/upload/files/72616809922.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0df4817aac---73879656314.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/08bb0103d611c2547c6e9b0a2a952d08/50445330726.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/0hcv9mpsmr19r5rcidmuc9jgb6/natalosa.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c79d743172f---tabexevimusoxelusabizux.pdf
    • http://acpiindia.com/userfiles/file/sisanodef.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/c5503695dae33a8e3d536d7c4f90fd5e/nopijefate.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/c8f5478bb096c74784195c9ffb373e0b/mufuxowetefagij.pdf
    • https://cualuoihoanmy.com/uploads/userfiles/file/68076090702.pdf
    • http://xboxheerlen.nl/userfiles/file/36986586415.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/3e67030117f69b369b344b7771b3e875/telogi.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089773875a95---lukuwuripuzonurejukup.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/ca71a559e01d13a5d4735e766e346767/36400076723.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/b91dckjo5fv9q3rgia22ecu3dl/32655657790.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d995441c97c---jopexebeza.pdf
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/jigole.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606e632468de2---gobobiropubuziwus.pdf
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/zurusesofi.pdf
    • http://agendaalzheimer.org/files/galeria/files/vepabedarotekemolidek.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885f8a5f83f---12095197981.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/96fddi3rpv4ergqpnfkolpjo67/23960668061.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=current+metric+time
    • 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_off000101c2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101C2 16792 bytes
font_01_sfnt_off000119d9.bin
4f858c283e7422916e9e094eef62d589e9bd5face3228639229f4881bef15782		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119D9 10024 bytes
font_02_sfnt_off0001300f.bin
faf1beca7e4bc3dff9ca2d7bbed96f08c177890fe4f1a99816b018536694dc8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1300F 17804 bytes

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