Malicious PDF — malware analysis report

Static analysis result for SHA-256 dda1cf097cb6ab82…

MALICIOUS

PDF

77.1 KB Created: 2021-09-17 10:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 045dc2afc69f68189ecd42541b6905de SHA-1: 70c26d60ae1ec3738f11d9a0d11804fb185dd29c SHA-256: dda1cf097cb6ab824167be707e04fee795d8ce4063d93fb6685d013dea1a044c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://irlanc.ru/uplcv?utm_term=konosuba+manga+volume+1+pdf PDF link annotation
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b401068af---17911645210.pdfIn PDF document text
    • https://dintek.eu/uploads/file/mogezikujexogudoges.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/80395750154.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/lubopesujuxawu.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/nimosimevonu.pdfIn PDF document text
    • http://inica.org/files/file///rironuvaxoxuxirosel.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/zabekaraxowagezegovutijem.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/katelas.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210903143158.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137525c74d78---66909223957.pdfIn PDF document text
    • http://hkwwta.org/userfiles/paxobafagipejub.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/2393395057.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/bebemulit.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/95571414533.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/6k47ed1uoc1h85gveboi47q732/75478237798.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/belonolikonubisomopiwule.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/rejekubolavarakukijeb.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/werale.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/litorejogoratem.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/54618322937.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/8318b5476cb5259c455c66a90993fa88/serunorakef.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/70779210070.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/sedabito.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/lomivago.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_off0000c4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4CD 18636 bytes
SHA-256: f573062889fb338d29b9c20341316d3549f042d02fa5b9a78fbcc70b44138885
font_01_sfnt_off0000f60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E26 10900 bytes
SHA-256: aa995daabd09c68d2c919d9a59571946031a642648c3dad8b0d9af7cc5f2572e

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