Malicious PDF — malware analysis report

Static analysis result for SHA-256 7704a2835ff5bb1c…

MALICIOUS

PDF

64.0 KB Created: 2021-09-01 12:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5b832253dfa283cf576b993381a92f43 SHA-1: 768250e0526fa5e6bd25111e083975782dab643d SHA-256: 7704a2835ff5bb1cec89ab98ad85a3c4ac0b3bcd5a11c32230732b6510056597
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document that contains numerous embedded URLs, many of which point to compromised websites or disposable hosting. Heuristics indicate it functions as a link farm, likely intended to redirect users to phishing sites or download further malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a malicious intent, and the presence of embedded URLs suggests an attempt to exploit users through malicious links, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5872

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 https://allytemp.ru/uplcv?utm_term=pdf+touch+up PDF link annotation
    • https://posaonakosovu.com/ckfinder/userfiles/files/leganogavenulupanig.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/95739004192.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/99993730864.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081d90777394---kofatudezudenavipe.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dfc5bb2ef---56058711550.pdfIn PDF document text
    • http://asqcert.net/files/files/desatagowuxov.pdfIn PDF document text
    • http://unseretochter.ch/images/file/67841456043.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/523a0e312faf39a8aca6f6bc4e2ae8b6/45271509672.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/d5ccb0d6810c2832bff72b5f897d0cff/14697095004.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/29275588742.pdfIn PDF document text
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/denekeva.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/b186af3f85138207af7a406c79720bd3/valobolutajuwujibisixo.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/dugifojenaxezazumuri.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/89864069354.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/a86a176a9b756cf9cacf98c253e94026/xevisuxuzubuvatiku.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/77174917748.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/wemegofux.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/8dfa74499f8e3ab6c26ca05d854ebba8/43634904905.pdfIn PDF document text
    • https://yodobashi-church.com/xegetalos.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/venasebarujobatomexipij.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/31605347796.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/sijazotubofufewufosigog.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/19890371342.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/fanifonavopokufapake.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/39298699965.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/9376784937.pdfIn PDF document text
    • 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_off0000c04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC04D 16744 bytes
SHA-256: bebc7ae28048fc3cebce8858218fa7a7c4116de21032f12521f8812e5ae14211
font_01_sfnt_off0000ebc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC5 10012 bytes
SHA-256: 623b0233aa66dba597585c99cbce77ddd8f11afc4659e7e1fd23aa2c57e078be