Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ff23e114f1c4974…

MALICIOUS

PDF

93.9 KB Created: 2021-08-08 01:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 45bd649e717da691843a5a7b97db374e SHA-1: c3aacff52e26ee058a2b8c2d3aa74ade555a764a SHA-256: 9ff23e114f1c49742e15017be5e84f711cd7dcd8a5785373cb5780df45d2f458
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other potentially untrustworthy domains. The primary purpose appears to be directing users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4769213a7dc053837d16d4370455125a/totufarewajutupamel.pdf In PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/836764e7422eb97c4d197fc26bf47c23/wofagupaxosunazet.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607b30e9da041---79785379975.pdfIn PDF document text
    • https://businesslife.com/content/files/40913551728.pdfIn PDF document text
    • http://congtyvima.com/images/Download/25969282477.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbc87eeb16---60658700324.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/89848551552.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/bosolikilomanap.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8245420814---37729077942.pdfIn PDF document text
    • https://masihpt1.com/contents//files/mujasovedolofakimovoku.pdfIn PDF document text
    • http://cuatudongnhatrang.com/uploads/files/83406039752.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/a55d7720201dba3fee15346c560ef0d9/zudosazi.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/32870898696.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/78050674122.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/kojuxojis.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/528c8244c06e48e18cb8d12abb95a71e/63933856.pdfIn PDF document text
    • http://airmon.hu/images/files/16052833332.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/022be8ec811ab158210fd0a53ea2babd/15959789716.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/9e98c190972fba0e510fa0bb4b0f9b01/20881099213.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/88699724240.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/kegukenupirudabofi.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/degibezizixupozo.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/bipazizifetujawemug.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/78615844956.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/xigasokarunebulig.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/bdfda260de3140050e41619a832c2ec8/87881744119.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=driver+touchpad+acer+aspire+5750gPDF 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_off0000fc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3F 11116 bytes
SHA-256: fef0d4c2bdb18c4ba680f79e304fa36250d701102632041e6b9ce1c8019daac8
font_01_sfnt_off0001163e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163E 23804 bytes
SHA-256: 5e8b7437c155ce77f6d065aaccada1cfbb5f613094fc55396398584ec1627de5
font_02_sfnt_off00014fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1