Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5df52bb87934a26…

MALICIOUS

PDF

88.6 KB Created: 2021-08-05 02:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1d9948854fb92fa68f5060b3b50bb7c7 SHA-1: 061784f41740e6ba8965276135e77199502f02b6 SHA-256: b5df52bb87934a2683f5c49aa5ca5c0a69cb33ae2e069b23d44280e1192f2a10
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous URLs that point to potentially compromised websites, likely to host further malicious content or phishing pages. The presence of multiple PDF link farm heuristics and the embedding of external URIs strongly suggest this PDF's primary purpose is to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/c1d57e6499e968227cefa9ab99161426/bipumutolirub.pdf In PDF document text
    • https://turbooto.vn/upload/files/89334414998.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/55591965319.pdfIn PDF document text
    • http://firegallery.ru/img/upload/tevelalox.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/3c84cc8d80547d087044a1fb66d65eb3/kaxuleleloxusapodudix.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/nuxegapakazo.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/53145180843.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/60805189334.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c790b463a0a---fiwufigefan.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/3hlnm9u33qlb3lrlta01cgfee3/vuwilog.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/e9pf8mreecut4odumr2n6v6at2/lopefusarewa.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/18542641486.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7994ee822e---18625323881.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d1c29203e---zojelanej.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/fazatigulamopaje.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/jovonawafebim.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/fupupajurer.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b2178813fc9---vakoriboxi.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/wadujofufumajiragiju.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e04e2f4011---63129846101.pdfIn PDF document text
    • http://webbuilders.com/files/file/910814306.pdfIn PDF document text
    • http://pk.mo/userfiles/file/75813196520.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabb8376b0c---80549270209.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=maher+zain+kuran+t%C3%BCrk%C3%A7e+mp3+indirPDF 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_005_off000108a6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x108A6 26964 bytes
SHA-256: c948e5e2c0457860bb4404fcd1aecaa553f8c54ea7ab7431f6858ae52ae54fa7
font_00_sfnt_off0000c567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC567 17300 bytes
SHA-256: 9a9d39d942fa6abd7fa4bdd99593c32ca5518f2ed0bcf0781537d7d35a47adc0
font_01_sfnt_off0000f095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF095 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13891 11128 bytes
SHA-256: e614f536f3e0108b7c99adf57cdb1e30b55d933b21a08275713bd6a450a7a1e4

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