Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe86d40d1c3576c8…

MALICIOUS

PDF

78.5 KB Created: 2021-09-20 01:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c9e4ff95a0e7ab310fa6d86b3f8ac266 SHA-1: 18f8fd7c1f3f59fb8288ea404ddbc7a7fd2de2fa SHA-256: fe86d40d1c3576c8d1d22bdcff189f53faf110df7306038da5d816dddf1d3682
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://net-mex.hu/ckfinder/userfiles/files/23033805251.pdf In PDF document text
    • http://tuvantindat.com/uploads/2021-09-03/images/files/28589062390.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/budujojimaliw.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/60368363242.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/kubosanewekudipepidugipa.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/51116760224.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/kaziloromeke.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/fozovuk.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614795553d608---totozukumexuzetezituxe.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e1660943a---21169958866.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/76147503532.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/xiwofulavofefatodokugun.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210907170216_5br5cs.pdfIn macro / runtime command snippet
    • http://nwatchonline.org/userfiles/file/50547805976.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161400334eb0b0---falipuwimadirez.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/88605784831.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/96899345690.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/pusobawanififaro.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/20594645984.pdfIn PDF document text
    • http://prosquash.by/data/47169292884.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/ruranekomipifopemaru.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/tovoraxozatakuguvef.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/ad8b35190446c23def424084082bca1b/tujubikolutijo.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136378b98aba---wepor.pdfIn PDF document text
    • https://colegiumaniucarIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=mi+a3+launcher+apkPDF 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_off0000ccf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF3 18036 bytes
SHA-256: a25873971466b2c41352df230a9006a857f64e1112498c1cf3a51e0e8a43d8bd
font_01_sfnt_off0000fba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BD 10440 bytes
SHA-256: 4f59e3c1664b707056f4c1ded6fcca4167b950a8ac301965fe6484d81f1a9656

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