Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aac38266b4b29ae…

MALICIOUS

PDF

74.8 KB Created: 2021-09-16 11:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4cc54e53e22db107f5e7386bbb6b80e0 SHA-1: 114782f42462f3933fc458fae833ba9108bd94be SHA-256: 4aac38266b4b29aeecaee0e48fa823a53421c80016155be35e8c51fa25438b60
164 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of a link farm on disposable hosting and a visual download button lure suggests a phishing or social engineering attack. The embedded URLs point to various PDF files hosted on compromised or disposable domains, likely serving as a distribution mechanism for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://gitedu.in/ckfinder/userfiles/files/31097765464.pdf In PDF document text
    • http://caratow.nl/userfiles/file/4192192197.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/61176598928.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/gejufagikomejujetajozi.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/zowukuteloginapisuvux.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/jegekuratujawonufus.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/mupuvugolitupadavafupasum.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109152131599237.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a90371e912---27464258840.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/sabemasivafinogiz.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/10753217762.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/24600689288.pdfIn PDF document text
    • http://dalaichau.com/files/pojamixifuwufurebarevuga.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/govonujatovuzu.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/634a835b1e77d5a465e00c79fed028e2/pezopabawarot.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/89875522241.pdfIn PDF document text
    • http://cecev.com/stockages/files/91067483465.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/35adsvmra52uldknvbqa1f3r97/97058241683.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210909_164642.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/88566305769.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613328dc9102d---dokanesufiriwol.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f16a16a3f---75833115450.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=telegram+download+file+location+androidPDF 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_off0000c0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F8 10700 bytes
SHA-256: e3795c4ecc75b3b264454c78252a537e5e5770f4cbc74a74ea6f98634c205df6
font_01_sfnt_off0000d95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF171 17024 bytes
SHA-256: 385f8edfa4b17c5f5ff628cc6a906d015344def39fc961971de2e21555478cee

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