Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d5cb93a9ae1713d…

MALICIOUS

PDF

85.6 KB Created: 2021-09-16 03:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f6995110021ca1a6e9265fd8664176e6 SHA-1: 1adc984bc185dfa130c8204634be91741ee10257 SHA-256: 4d5cb93a9ae1713d452a49bdbf31bd6e8c86ad35eb597bf42e978bbc4bb9aa16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to manipulate search engine results. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

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://esvigo.com/upload/files/29458869903.pdf In PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/36113911065.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/mizexajutig.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff5142e3f7---88091484512.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/vimawet.pdfIn PDF document text
    • https://digiconelectronics.com/media/95153947662.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/linunolarujatefabu.pdfIn PDF document text
    • http://saktigroup.in/uploads/38585148028.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161396f0906f4d---wogegegitibupalamale.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16133ca761e463---mavonejipedaxejidoge.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/ronomejezomas.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/derolopexidokopelijoxitiw.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3d3775eaf---tabovusib.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/raduvux.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/vogiwidu.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/cllr10uqflmgapiq98280lnlsk/xobavevufelalitemoxa.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/vajemasazozesemisesowa.pdfIn PDF document text
    • http://study4student.com/cache/fck_files/file/kobikekopofivixadile.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/85237333281.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/39241394996.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/45723418465.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/88073466192.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/regitiveboresej.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/dawapomovexejatasapomof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=unblocked+games+24h+run+3PDF 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_off0000e8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B1 11336 bytes
SHA-256: 43585896ba17d3aeeed1e79d559556c5d4f91815cb4a2cfcfc8b9b3f6c63e1a3
font_01_sfnt_off00010313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10313 17792 bytes
SHA-256: bbc8cb190977ad4332763752e2aee6e1b4a3d9b6a763ea316901fbe38890a009
font_02_sfnt_off00013110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13110 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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