Malicious PDF — malware analysis report

Static analysis result for SHA-256 f406a3b2b752f3ff…

MALICIOUS

PDF

76.2 KB Created: 2021-08-02 01:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8ff49d5bbcd85d2ad2b543b5267972cb SHA-1: 5825dcfa18af7638ca2bc514c1cc81ffe1f7b183 SHA-256: f406a3b2b752f3ff2a869b356eb9d284bcc096db3d41eaca92b358ca15a5a514
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, indicating an attempt to lure users to external sites. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a malicious intent, likely phishing or malware distribution. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3069

Heuristics 5

  • 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
  • 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://sns.hu/_user/file/30555444738.pdf In PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16096b6ee8b1b0---kasakinotajopozanoribev.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160edc408c9943---xipodizo.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/ebec75e610610ad3260adba0073cdc52/xokali.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/wajodefekawefimipabikoduv.pdfIn PDF document text
    • http://vejwun.cz/images/pomitudesav.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/wotigububewanuravedexewul.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/65958310866.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ac5e3a9b5---mamikaw.pdfIn PDF document text
    • http://qca.ch/userfiles/file/24575042594.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/71038742595.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/16a86e80685eef833d00479500e2c01f/faxajokiveganija.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/belorixofopiziwidipuvitif.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/karififafuxufemarozak.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/0e9938e095923463c13d6f046b9353f1/51142795154.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7861b0701---vewitokex.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/zavufuwowevebov.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/munabiperogopapilezev.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b32e609d5b---dumofubuvaxakufepuribuzes.pdfIn PDF document text
    • http://gfhs1978reunion.com/clients/56625/File/nekufikidalosivika.pdfIn PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/bamowena.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/pafanoviviwedosotusegona.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/31bcef29fee8024abc24075681fba737/finupevigi.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff2bef23be---sejenufeletulegufuxet.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d620ab35e36---bitanetimokejinudelarez.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/7njnk4hchaqbgpb35op6isbp3s/dujopugujuxowitebizusux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=descargar+papita+mani+toston+2+dvdripPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD901 18336 bytes
SHA-256: b8722d8bcfe78029be9241d7203bc2b4c00227d6ebe62cfd024d0891487816e4
font_01_sfnt_off0001080b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080B 11000 bytes
SHA-256: 5c4bb5f38931c17d1c03656356d345a387980784a6733af25c6edc0476dbe02d