Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bc5cf356d7f1ae7…

MALICIOUS

PDF

78.5 KB Created: 2021-09-10 08:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 02a8ee928a30f0e28f13b80bd7e9a79a SHA-1: a2d679b40b164fe7de898ce411c5e2d6962e1149 SHA-256: 4bc5cf356d7f1ae79a8dffc309365434be4f61f487f9a77cff9967540dc47577
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The embedded JavaScript likely facilitates the redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://coretry.ru/uplcv?utm_term=iphone+facetime+for+android PDF link annotation
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7a0a1e3a7---4310831313.pdfIn PDF document text
    • https://ibericadearmerias.com/file/didaluj.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/cf140c539ac5a0f66703cada5ca83eee/binodufusabebon.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/57617483046.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/7c086ba228f8af5c7e646809852cd5af/nikotazinupo.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/berosedobo.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/18693800964.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/31461772215.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/78445436192.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/28544551707.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/mavemusakuvatut.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/50053147999.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/dizesil.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/48058540624.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/bunirerow.pdfIn PDF document text
    • http://wych123.com/upload/files/kurobog.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/lafaxijag.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/meguzipatov.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/depalusopuregarumi.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/25792827241.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/zafajowerumejar.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/pibovenevepevugavogu.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/8881867110.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/92157976898.pdfIn PDF document text
    • http://e-hematologica.com/users/file/lakudab.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_off0000c37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC37F 10624 bytes
SHA-256: a369abd77e95066a96596270b4b2336f31717f412df5a7e208e46849d0b51ad3
font_01_sfnt_off0000db95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A7 22232 bytes
SHA-256: 6705ae6d4b03eacb9dcd8f23c7db119087257060891bc3c0350ac92863ad21c8

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