Malicious PDF — malware analysis report

Static analysis result for SHA-256 1338861a03cb0d46…

MALICIOUS

PDF

92.1 KB Created: 2021-07-24 14:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3dbec8ca8a3cca460f1e8d0174ee2c72 SHA-1: 76edde8b5cda65220b19c76cf247c0d3f03b2b53 SHA-256: 1338861a03cb0d469a89c6e4e77222f85ea449e9af14192461d4b12513fd76e1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to lure users to external sites. ClamAV and ML classifiers strongly indicate malicious content, likely a phishing or trojan delivery mechanism. No scripts were extracted, but the structure and URL patterns suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/67cdde2834d7d22ef780011084a8df59/55963915405.pdf In PDF document text
    • https://flyags.com/editorResources/file///femozo.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab163747d7---75334581802.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/54567341271.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/2429af719a372d5392611173de9e1fc5/fuzaropanu.pdfIn PDF document text
    • https://impactcleaningserviceskc.com/wp-content/plugins/super-forms/uploads/php/files/1d56473ede8d3f0f753207d438abd33f/81440091581.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/mumifonekoludegedifusu.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbf5d47b5b---70108205463.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160892bdd2755b---kuxodoberodafoxuwup.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/99170218659.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b453bb61e79---57702722187.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/zekosotenexafufamip.pdfIn PDF document text
    • http://biosite.ru/images/news/file/vupizubiratafuv.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/40850015690.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/92164543541.pdfIn PDF document text
    • http://lakes77.com/clients/47041/File/wipenib.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/98748524299.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/5jukdvkelptpcb9h4fut181851/12315941231.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607cca5da7ce6---94620775509.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/negagupupevijofuwotev.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/kotirimugibufukapesejixo.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/5a97677f068780a5e08638eb8a01197e/50407751948.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=clash+of+clans+server+private+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_off00010424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10424 10768 bytes
SHA-256: eba0292cd8bd319c2187fa6887f50612838fb2f184fc951ea37ce4bef0bbf460
font_01_sfnt_off00011ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE8 17200 bytes
SHA-256: a9c7c074be112b0570444f9c86914519d8689f8a97fc4cdbd2991870cac7dea6
font_02_sfnt_off000149e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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