Malicious PDF — malware analysis report

Static analysis result for SHA-256 2751cd61b774b69b…

MALICIOUS

PDF

79.0 KB Created: 2021-07-15 20:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: be73f72e46a89f8800bd710dbd0406a7 SHA-1: 91d55cba6a8a15ee2b9856b3d563ac8382d0238e SHA-256: 2751cd61b774b69b3bd3055f525878d29245c8775c41820a28a1d2742d10991e
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as a phishing trojan by ClamAV. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4851

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=piano+chord+voicing+chart PDF link annotation
    • https://eventaipei.com/upload/files/kiboroba.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768317d15f0---sesikukidabukojusilupusak.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ddc31ef7d---34480590925.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/vovesuzigowamo.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/aa4f4fb9b1164a383b7395702556a6f6/50410486157.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/merisapobanakofawe.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/5mimpjka2pohpm9at35v6dgojv/96858549699.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160770100cc601---wawetosaxumete.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b966d64510---61529819117.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c87fe455a7---godotebapoxur.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c39eb542bae---8990527192.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4003ad6c6---berovegevajutusafimixip.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160820610ba6a0---52443009832.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/mitatibikadifegifafal.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/57649792551.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce9752e6e57---mavadokaw.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/96297611294.pdfIn PDF document text
    • http://askort.pl/Upload/file/67695130639.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/8001ef7f86329f101465f6d191f0ea8c/89038842882.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/s3i5e3j8gb4kj2gj9pdud3mbtf/namalidatevejibedakuk.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/mkiatpc298h713n726p22ode5h/mimofamapagirunodubo.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/patagejobuviji.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/57521757241.pdfIn 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_off0000e241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE241 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA58 10372 bytes
SHA-256: 5e8773cf46b21d958c16a48ff3087320929f2292afec7c32066d745e7c76ed57
font_02_sfnt_off00011182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11182 16956 bytes
SHA-256: 80e6063291c376c3e7822cd8ac6f78eb43259fffa3f1172f0090e4f2a0f65004