Malicious PDF — malware analysis report

Static analysis result for SHA-256 e612a56cb91c6086…

MALICIOUS

PDF

81.8 KB Created: 2021-08-04 16:30:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 183ca0f200ec6d71a2a103bc72a2e92d SHA-1: 429b4c071df5e293d6eeb0f17083be62ca3f65eb SHA-256: e612a56cb91c60866afd0f1af8ae13f07df4199d025876c8b618948fa2162167
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier assigned a high probability of maliciousness. It contains numerous links to potentially compromised or disposable hosting sites, indicating a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit vulnerabilities or lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://metnar.pl/web/uploads/files/30591288475.pdf In PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/gikupineludadegu.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/senaludu.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/50d1afba59d1ca21cc290f267fc73dc4/40610934924.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/25360316508.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/vemisavonileva.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf4fb00425---84006040790.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/47151940839.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608adf2a7069e---doliwodelinadojijadatetim.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/ba3e9a88b3f6f79bc5b697cd83a7c8d1/gogurukusejufiz.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/3c88ef4d4dfa00a5e8b88bfa2f1b312a/duliw.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/pisigukokisibuporisumo.pdfIn PDF document text
    • https://rintrans.com/files/50335795358.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b33426def---lojenoviferuzureri.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/ec114fe5b00676578019647a87c0f397/fegamaduxoxupowokurovev.pdfIn PDF document text
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/18254854283.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/5d39d134b9b005db8b548ccf8f994f59/14170850230.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/79146174024.pdfIn PDF document text
    • http://abpaluso.com/upload/file/98410544952.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=togaf+9.1+foundation+study+guide+pdfPDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/49324722496.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_off0000d5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BC 19232 bytes
SHA-256: f39f4f5d5dbca044a73259d0c6e689db25506dbfceb9ccee1abea1ed3b48bda7
font_01_sfnt_off000106ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EC 10988 bytes
SHA-256: b647d6190509d4403ded2584b6c23d5e4ec1fcd71576b69ce1c5864d3459c2c7
font_02_sfnt_off00012081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12081 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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