Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3d0eba1de10f034…

MALICIOUS

PDF

93.2 KB Created: 2021-08-17 12:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4af0c3e604acc123a9f5e80cd59364fd SHA-1: 1c59b8cc2b1a20f32c3fcf8786aa6da2678b653c SHA-256: a3d0eba1de10f034c3555faec43e545626734cfac5cd587eceb2ca015366ee00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to domains that appear to be used for hosting malicious files or as part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for a large number of links, suggesting an attempt to obscure the true destination or evade detection. The presence of multiple links to potentially compromised CMS upload directories further supports this. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://vtdsbinhthuan.vn/public/uploads/userfiles/file/dipisoravivujaz.pdf In PDF document text
    • http://citra.cl/userfiles/file/pevovalul.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/81021039477.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9289c98927---63965926367.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/29975384523.pdfIn PDF document text
    • http://bjeclinic.com/ckfinder/userfiles/files/74846723196.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/kozilopok.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c6294e899---60420892296.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/4de1bc642b9f3ab8d5582006b1f3e137/kusofakogilolirowuminori.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/notufowodeko.pdfIn PDF document text
    • https://giustofiori.it/file/perebonuni.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/71593798313.pdfIn PDF document text
    • https://signika.pl/Upload/file/sizevazajimetazukus.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/kevojepomejomugupadebagub.pdfIn PDF document text
    • http://stpatricksreunion.com/clients/84553/File/gukofitoditedefiteso.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/gadumixomolize.pdfIn PDF document text
    • https://gyandeepjkss.org/userfiles/file/64102002731.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/36d8723876d87cc8d8a4de459b0ab687/79482952763.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/7663243abdd58995a9175f18a39ffcc4/zumeziwebijixalatipukufan.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/logojop.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a2f6414ba---terowevapezijexigupenix.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/46675031615.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/258a2fcb43f8e6efa4998f336e82c98d/98480532267.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/tivuzalibomukotewonisidiz.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/55606109488.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=kitab+barzanji+lengkap+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00013049.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13049 18932 bytes
SHA-256: 0bf9db2dbe71afe431421c7f629872084c6f657119930a10968d88a84a4b12e6
font_00_sfnt_off0000ec27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC27 16876 bytes
SHA-256: 8bb029437f07a74da595934ace81d4525b22db69d95eccb81008796ba7d630ba
font_01_sfnt_off000117bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BC 10800 bytes
SHA-256: 5a2aa71d20c560d3fe8970ce138ae6987820738aeab1491f979a8cf25ac1727c
font_03_sfnt_off00014eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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