Malicious PDF — malware analysis report

Static analysis result for SHA-256 eee4f3d2ddb29e6c…

MALICIOUS

PDF

86.8 KB Created: 2021-08-14 01:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3c2b6271adb754704e065a56d7413560 SHA-1: 8de8ac178d074edfbf9b0ce93c525fccafb5e78c SHA-256: eee4f3d2ddb29e6c75eac7c7c8c9132663461d377d1628bc7e4399247ae4ab7c
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common method for exploiting vulnerabilities or redirecting users. Heuristics indicate the document is a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or engage in SEO abuse. ClamAV detection further supports its malicious nature.

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
  • 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 http://szyqjsj.com/UploadFile/file/20210810175535073.pdf In PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/94995900053.pdfIn PDF document text
    • http://agama-rc.com/upload/files/16227138872.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609deef2b25a8---52735481671.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/4l45mhtsvapru9u7ugefrb2mkv/podulapugut.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/56574593486.pdfIn PDF document text
    • https://congchung7.com/upload/file/pozunojiwejefugikidu.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/lilefikenizade.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/vadugamelarevarituwaten.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/gananosuvapifer.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/nomedazididikidubir.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/xipudifiw.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/12196953904.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/tagaxa.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/cbe962c90d6a5bee74c545660d90507e/sanodikez.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607b3fdfd35b9---6016455522.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4om6gcg5lmh32v2blngge12184/xunopetitozukikujufira.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1cfee62db---xeguw.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/sokanodone.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/rodelolirav.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/sagitosisigirezexep.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/repijusatale.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835bdeaefc4---suvojixuniw.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/f6ca7c45d77ab5632e637d203d833cc6/dujukofifevofaw.pdfIn PDF document text
    • http://haki.vn/uploads/files/97985569974.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=what+is+imagery+in+poetry+pertains+toPDF 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_off0000f11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11F 16788 bytes
SHA-256: d732defcd3b98273a7f9c6da22fecd60dedad6ceea61ed3ff63c9be4bd92fe23
font_01_sfnt_off00011c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C67 10760 bytes
SHA-256: 493c9ef2a9a18152c0a048559a31965db6477f8ad91ee628324921dce0b60090
font_02_sfnt_off00013502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13502 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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