Malicious PDF — malware analysis report

Static analysis result for SHA-256 124189e4b3a6d79c…

MALICIOUS

PDF

77.7 KB Created: 2021-09-05 05:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 57ea8680d25131f8a797f6ab1a68c21f SHA-1: 983d2f4de2693e28828147e2a3125c4873ac1532 SHA-256: 124189e4b3a6d79c9d887577d53686dc24f73900dd8676d9c5e92e3c12db28f3
124 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous URLs pointing to various domains, some of which are hosted on compromised CMS upload storage. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to lure users to external sites, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings strongly indicate malicious intent via external links.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3768

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://smidgel.ru/uplcv?utm_term=maths+code+breaker+worksheets+ks2 PDF link annotation
    • https://ykitraders.com/UserFiles/file/misulevubeta.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/laxuwagadezufedirej.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///navifufawesazofutidazu.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/96666632201.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2177660e13---vosepebil.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d7206fe42---81983580002.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/d5e53265deb5263397ff75cda2f74613/xitevoridobakejuti.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/79309983676.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607660ab8f3c3---vunelitivalamef.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3bd6e4c4c6---68609900922.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acaf49085f7---pogolowesinufutifuzasamu.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608634199632e---turiwomixuragatizur.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/nenabekom.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098739bf096e---monapopomoxegikomowa.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/72823371993.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/nosutemarowaregabudomudux.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/zopuf.pdfIn PDF document text
    • http://fairview66.org/clients/866114/File/87708043021.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bfa1841db---jedewujekesuwenur.pdfIn PDF document text
    • http://fitviewer.biz/files/file/lusewexef.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2afa2f964---mowido.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078be9f5957e---51469650579.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/74100008719.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/75519272916.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_off0000dc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC24 17408 bytes
SHA-256: 3c7d9b4ebdf38e74ac31bf082457602ae5c8ff123e7669f19951c803884f20b1
font_01_sfnt_off0001089d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089D 10656 bytes
SHA-256: dd40ef72eb40f3bb7d59860dc878bb36bcd3b660bf7a5a4c1c28818ecb4ca1a9
font_02_sfnt_off00012159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12159 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1