Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9858fc62fbc15a3…

MALICIOUS

PDF

66.5 KB Created: 2021-07-31 09:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 43ea4d1af9198d8db92e632d045ff2ef SHA-1: ec4720873db89bc59844064939fc09dddf1f5808 SHA-256: a9858fc62fbc15a3e877c0aac08c4caa15622de20b603adce5ade44552eb0603
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate an attempt to lure users to external resources, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8898

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://synerhu.ru/uplcv?utm_term=cuales+son+los+beneficios+de+consumir+clorofila PDF link annotation
    • http://amuseonline.com/absite/userfiles/file/visaluwapiwafimaxed.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/lazukememasobumideposil.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f4db8b946---jijugomekur.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/pukemoxo.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/5785d8eee7c486b507ad647a55ed6afc/mixeb.pdfIn PDF document text
    • http://xenangheli.vn/public/files/tevikutixijewotimavu.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54885799302.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16100534dee5c4---fezev.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160996dcd6f40a---6508973169.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bc43cf9a5---xezatejuruzokujofuf.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/rapen.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/kusim.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/junusapokewanejebekeduf.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/632b8be8f663604b2c13c70e1d60e831/82260302333.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/96b24d8987ad5eb7815f49cd8828754e/36222025937.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/zepipofotedupekelewedok.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/wugumesepinatiza.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160ab44c988617---pomubokadomepulomiguta.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/32373091745.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607defd17094e---11954222654.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/kapurumevusade.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/5396bb4c5622738cf86bca7d2ec2f3d0/26411610580.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab6458bdc6---dutatug.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/nutizive.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/18004795235.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1436d5df02---rometekefipepo.pdfIn PDF document text
    • http://zuche0551.com/upload/file/jojuxem.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF636 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1