Malicious PDF — malware analysis report

Static analysis result for SHA-256 54ddceffb4cdfb0c…

MALICIOUS

PDF

74.6 KB Created: 2021-09-19 04:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 71938391f5c9b1f8a81eda9ae1a96dfa SHA-1: f8b833488db1d117773c3823fd350a71061fd1de SHA-256: 54ddceffb4cdfb0c880d8b58037a5afeccdd5e0b7f2fb4180a2619c8b8bdbe37
164 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics point to the PDF acting as a link farm, directing users to compromised WordPress upload storage and disposable hosting, likely to serve a malicious payload. The presence of a 'download button' lure further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a70df44237---jimidumimimolatobi.pdf In PDF document text
    • http://ckm-machinery.com/userfiles/files/60844148379.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/88694320184.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/24561503993.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/mevinapefegatanisogupusu.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/864474155.pdfIn PDF document text
    • http://headrepublic.pl/images/files/vilamuwirikumemuraba.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161460b0dc0d63---62963058158.pdfIn PDF document text
    • http://cartopack.be/Images/file/kefabubuv.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/67280653769.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/fe347be4708a4dc7dabe908b979e785c/17018665368.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/45511192056.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/manadifuneb.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/81144052828.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/menojeli.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/49048203742.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/wepalonozuxa.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/kofesumotubenalovawej.pdfIn PDF document text
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210912080634.pdfIn PDF document text
    • http://cuiquji.net/d/files/vipomitetotomixud.pdfIn PDF document text
    • http://hnyinfeng.com/d/files/tikodapetavo.pdfIn PDF document text
    • http://carbonelite.ru/file/85946969045.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebe8ac64c6---sonumigopodas.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/xomevirodabujoranotefu.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/luwojinivuwegogiwufolorad.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161438839863a3---tiwiw.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/6456349449.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=new+english+file+intermediate+plus+student%27s+book+pdf+downloadPDF 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_off0000b9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B2 18448 bytes
SHA-256: fa8961d05ec81ef6393f1ee6c42cf9eb3cbe8b1254d367ef167f725fb3542250
font_01_sfnt_off0000e9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DD 11372 bytes
SHA-256: 4a8b06ef3236f3644a320433316d90c88d25ee929a7a6bc9ec18fdfad4a59238
font_02_sfnt_off00010419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10419 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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