Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dbc35630f0ddb0d…

MALICIOUS

PDF

82.0 KB Created: 2021-07-21 21:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e1ff9b1222af2cb7b480d81f1248a0e7 SHA-1: 4a4fea4abc8558aaa8d4f1231c5d23d83d736ffe SHA-256: 4dbc35630f0ddb0dbddbb77a857f4dd8e1e17fe2926a02f98bd7b78b842a7fb7
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains multiple links pointing to various websites, many of which appear to be compromised WordPress installations or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://webinaris.net/ckfinder/userfiles/publics/files/41346459669.pdf In PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/4b15f85fcc312d4d3b2abdc86d2586f0/gupawakidij.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/8851qu2ij8uve7npk2s90h1405/zinunezutisorireg.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0e48e311d---39831271198.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a2d0a05fa---10247559350.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/62139007024.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b1dfe4cbed3---85472148582.pdfIn PDF document text
    • http://abc-tel.ru/data/File/jifovawiwawime.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa4358c76e---dubugonadoji.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adfa71ce25c---medaga.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608912b8b5b6e---dimuzubewikaj.pdfIn PDF document text
    • http://humboldthighclassof79.com/clients/1/19/19f040aad945c40a0acbd79abd3dc6cb/File/vabitaxosepeluga.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/96120710874.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/44210194163.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/82c4n7fusarhubifg6idok2fee/67179176567.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/b76708c62e45fa02e55d519f778d7b03/30912478824.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9137d5b88---10698614343.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/besiximowerumifapi.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/venejigeze.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/9e315a5c08ec1be9d27332dfb6f861b6/12328087882.pdfIn PDF document text
    • https://ortechindustries.ca/ci/userfiles/files/rapexupumunufobenekaxoba.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/pupajawukufapawozowob.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607068bbe80a0---68422559069.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/tukivebipi.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/lagawewawojipoxolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=number+of+tamil+lettersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4FD 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
font_01_sfnt_off0000dadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F4 10488 bytes
SHA-256: efaf3c82d5ca8d525f37a1b2c56dbfe3bae1c124e7976d30e809f52921475774
font_03_sfnt_off00010acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACF 17292 bytes
SHA-256: a34b1c7d4237dd2651aeb297ed93405b4b8da675f566697399b143b8fb6d208d