Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aa62ec880bdc9ba…

MALICIOUS

PDF

88.7 KB Created: 2021-09-08 07:34:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: b551639ae7fc7237d5a387dfab4f7a8f SHA-1: 29c651f288fc575ee7f6edc053c98b716c5d345e SHA-256: 2aa62ec880bdc9ba5cbf2351f260c2544c38cc28622865c7c4241b0430a36ba2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://krisoc.ru/uplcv?utm_term=human+development+index+introduction+pdf PDF link annotation
    • http://vetranhtuong.info/luutru/files/dibabexivo.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/11675443605.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16084a477e2f92---votamumofixabizigoledo.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/p210tn72b4o40c5b25ab4ug2l5/jekovojituzixutibi.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c38a08479---kixekikojibo.pdfIn PDF document text
    • http://williamshudson.org/clients/3/35/35bf74ce48b5c120232fd40fb4fe3e45/File/dewiwamoparuxigijaviselut.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/98332890174.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/e125f2bd83d2a6584747631df5775ba9/23217281756.pdfIn PDF document text
    • http://dchs1961.com/clients/871949/File/jedadosarekofefat.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/af4ea18c75ebf89f14482f6cf13098d6/kowebokunexavawutamupapu.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077019416363---77537989499.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/748l32m4c7je7ah06mc4sinnc5/44070032948.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/5950674186.pdfIn PDF document text
    • https://best-label.com/upload/files/putewapenoj.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/74825908658.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/23720029845.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612121784a23f---fosojezopuwesazexuk.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/xolupitanexof.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/55956726452.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c64714531---dorafodupesimibizi.pdfIn PDF document text
    • http://hongdacable.com/d/files/68184980448.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/01fcf16416f00e385bb5bd541e92209a/navelibuf.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/209u1vacer6km0q48d9s1q0q11/15929407572.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/zezokukuzevut.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_off0000efb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB9 10872 bytes
SHA-256: bc0118fef85b5b9ce1b17b4bab666948e78a1ca52467d0f82eb5e6bbd5086755
font_01_sfnt_off000108bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BC 19784 bytes
SHA-256: 4494183bc8cd5412fcc4dd5f53e56800f84b80d18498d307e05e0bd9e0376655
font_02_sfnt_off00013cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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