Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cdecc1f3fcc1bd3…

MALICIOUS

PDF

69.8 KB Created: 2021-08-13 13:35:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9de08384c4f6ac3384e71cfcc6319b8e SHA-1: e0ef21cedb0da8b4f9b88e5b6477ef42b85fb5a3 SHA-256: 6cdecc1f3fcc1bd3108f822944bfc9628498db3d8cd37cecfa8a8c5c1ff13fef
124 Risk Score

Malware Insights

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

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to various websites. Several of these URLs are hosted on compromised WordPress sites, suggesting an attempt to leverage these platforms for malicious distribution. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4326

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://queure.ru/uplcv?utm_term=telecharger+music+gratuit+mp3+rai+algerien PDF link annotation
    • https://12shio2.com/contents//files/lewijefe.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/e96cc309516f754ad68399fab51569b3/wubelositidoputuxipaf.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/6553o2g9d9p0e77g9vv67j9hec/gorupiwofoku.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/7c880b8a9605a27a1324841ef5afd0c9/lebuwubulusixezulepipat.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/vemamoxifazob.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/depujalirapamifumif.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/16133166512.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/g2oaodeqdf7hi8o8ig1mlad4i2/mozoju.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/zizaxixunarutid.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9ced44ef---6946636744.pdfIn PDF document text
    • https://computerzone.pk/file/rekekesebafinoriranej.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3b034b9f---46059155607.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/jabezixujidatukuja.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721026da48e---zawolasolilasunod.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/71511590214.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/78027366579.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/bored.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8ac7264de---45437427559.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/pamujasabuk.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a97b12de8---lawowipetujuvuzanovi.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/lomumexa.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1c26382c7---38918499135.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/towubudigifogowu.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_off0000df69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF69 10936 bytes
SHA-256: 6ac2ad351adc17f283a7ef014dc45ad14b9d38b4cec14e4470353e40dfc5260e
font_01_sfnt_off0000f8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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