Malicious PDF — malware analysis report

Static analysis result for SHA-256 45aa1736b747c916…

MALICIOUS

PDF

74.1 KB Created: 2021-08-28 02:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fd6cdeeee08decafdf091756f9c83190 SHA-1: 544f339a7b35d4e86feec13a49c52cfa4c870c51 SHA-256: 45aa1736b747c916e62f97c26c1e857956948cbadf81ed162fb365e08dc031d5
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple websites, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous external URIs and compromised CMS upload links points to a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://camgloberealtor.com/userfiles/file/gijizegutidegege.pdf In PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/debd5011dca569cbe58bca8a84c87a08/sozudof.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092235817ea2---46144997431.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6164d13e6b---41370251108.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/20134145622.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbe8954182b---nigugotaj.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/a59df17423ae5e68e675a06ff934d2ab/26069585273.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/xirifav.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/3s3khfu9bkc9fj1a15ranphft0/53215141799.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/30a504886de8b0206faf175f02da6809/61335450893.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/b758370220f0132cab8846ccec8be7f4/mexoma.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/97785006106.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847200641d6---6466552033.pdfIn PDF document text
    • http://stylekd.ru/files/63050419601.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/jufogaxusemezulariwekuto.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/a0n7cfv0bosc729m80rs5damhh/71335842146.pdfIn PDF document text
    • http://ebanksunited.com/clients/7/7d/7da19d52c1086e69e61582739ce98a0f/File/mimixalugipopogavudebi.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d3b9a4b58---tusot.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/2a0737b5b83dfbd525cd3f0163ee8be1/tixojeduteki.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/83257690979.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/dubimesagatuti.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/gitizuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=8x4+loaf+pan+equivalentPDF 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_off0000bd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD27 16808 bytes
SHA-256: cd416916a473cb20920c081b0bd81a8a1f9d52c35205aabe29e59ce2d9f87059
font_01_sfnt_off0000e872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE872 10684 bytes
SHA-256: bfc9390f008922836a812ba2a29f2c7c144ef3e748451c34a0d6f89ebe797b08
font_02_sfnt_off00010126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10126 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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