Malicious PDF — malware analysis report

Static analysis result for SHA-256 acb2efac9599fc66…

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 01:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6a26e0dc5adad3bd93a6225575f2f40a SHA-1: b0f5728839fb448a314c9c73ae32cf7a5ab1b502 SHA-256: acb2efac9599fc66a490c598b07451bff28d1c50bddd209126ea3e09d90ed35d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing lure. The 'SE_MFA_LURE' heuristic indicates the document is designed to harvest credentials by mimicking multi-factor authentication prompts. Numerous URLs pointing to potentially compromised sites or disposable hosting were extracted, suggesting a broad phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://adikkedua.com/contents/files/xikibuxuz.pdf In PDF document text
    • https://hyosung-gulf.com/uploads/file/daresekusepojit.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/vipapifidofefater.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/zodujawetalomopidanugiton.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/5465388967.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/18283145304.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/52310430734.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/48214161565.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/74507585944.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161430bd19c6d7---78611348849.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/vuramulom.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/gevilorusipukezevi.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/33518923384.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/68092626219.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/82004086173.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/26743838074.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/tokiset.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16137403617a44---zefeguzifosipoxew.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e76babc17f---67130503316.pdfIn PDF document text
    • https://combrooncom.com/contents/files/tiludaribawamigugeviwi.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/gagorejefomomurulat.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/41044420580.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/27294500875.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/lijomax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+transfer+call+history+from+android+to+androidPDF link annotation
    • 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_off0000dcfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFB 17580 bytes
SHA-256: 7cd59a989d7221876da313cf59198bb8fb285105b87a7ab4f9f735d5c237985d
font_01_sfnt_off00010a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001226f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226F 10932 bytes
SHA-256: e93e81f54f0cf6a7381729289a524c53d6a73ffced7cb2dcc81e36ce2d21f923

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