Malicious PDF — malware analysis report

Static analysis result for SHA-256 a34099be66638c1f…

MALICIOUS

PDF

80.2 KB Created: 2021-09-20 13:26:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6ff79909b72415ec88003516436c36a6 SHA-1: 0e4227655b4d3d3662e5e1ae9f1f37b0d11c27b4 SHA-256: a34099be66638c1fe924ecf45929375851efdb6d448fa346dc39e54decb6f35f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS platforms or disposable hosting. The presence of 'utm_term' parameters in some URLs suggests a phishing or SEO manipulation tactic. No scripts were extracted, but the overall structure and URL distribution strongly suggest it's used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://cructi.ru/uplcv?utm_term=led+keyboard+lighting+mod+apk PDF link annotation
    • http://polyalpan.hu/_user/file/14117573940.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/75473882836.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/fugiwoxutujev.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/vedapira.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161426c3f4f3f9---65848625791.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/2548177371.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/puladexuroguzux.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/37922790934.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109101800467846.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/98376787035.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25227150354.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/14432889984.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/widodosuru.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/24811679132.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334f49c1631---43022185837.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16145525d677d0---21103325129.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/10317855431.pdfIn PDF document text
    • https://rintrans.com/files/89352190743.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/73124755942.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16134080585795---zugamoleg.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/sabupa.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/6415142629.pdfIn PDF document text
    • https://blogsma.com/files/61413193777.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/25204429948.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/verilevujaka.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/87329998329.pdfIn PDF document text
    • 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_off0000d558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD558 17100 bytes
SHA-256: 371f20dd5d9a5754319df7945b1d5e81a7e70e5dd3567d61f83b92c06e96bf28
font_01_sfnt_off000101e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E7 10972 bytes
SHA-256: bc4ffe72313d0d8cd42a01ce0a97be160db7b78d0bb555f4f5e41d6fd48099fe
font_02_sfnt_off00011ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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