Malicious PDF — malware analysis report

Static analysis result for SHA-256 a26a1ba5be28b0d1…

MALICIOUS

PDF

92.1 KB Created: 2021-08-13 16:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: df3b548d897bffd60327347f3eaaa1db SHA-1: 333f6b9f3eab256390da441d8934bfd4fcd5254e SHA-256: a26a1ba5be28b0d1b44ab06f27793bcfdf0809b204acaa492e282771bba90796
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous external URIs, many pointing to compromised websites or link farms, suggesting an attempt to redirect the user to malicious sites. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://krisoc.ru/uplcv?utm_term=how+to+reschedule+a+meeting+via+email PDF link annotation
    • http://lapawan15.com/shop/fck_file/file/kunolimutajonavutejeweg.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/e0d691b0ba95920bc0591bd80fa7995e/vajogen.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2c42c15a047f9b1db737b0d895b9f4ed/7836937009.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/32982523964.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/31996958803.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/edprc5h8pci0hlhm7hfvq4e2jv/mamikunorumegu.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/ninosazunibawidudumefole.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0d6f730b9---38199390093.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16098ef7ab3fe5---33029442877.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/cd351cfc0a9de20ca9d29ba402192a8f/60470266048.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/zorotoguvobupekox.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/68435178084.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0b02c4303---tufupoxilebekekimawu.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/16934700334.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ca3fdb596---60038989535.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/2107141409569514505vret.pdfIn PDF document text
    • http://didula.com/img/file/91345806142.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/91045950673.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743bb801fd0---rijopoxubis.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/vebulolurizidubiwurupos.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/003a5fbb7c0a94f92545080698e4c0ca/95026604928.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/59c7a0732fa3d6f0e3cbeb5c43e6118d/guvejanezawig.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/fifiwos.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078ea603213e---bifikopojijezur.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2e52a8a88---fasafikiwu.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_off000101c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C3 18192 bytes
SHA-256: da58d4671e3276c2808055a3b3bfc668250289fc0c0493b203e1dfa375acf5bb
font_01_sfnt_off00013167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13167 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001497e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1497E 11060 bytes
SHA-256: 89eaa8550bf27209e24d112935b3c8c4d630d825e9991cc71045debdc5dfc249

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