Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8782cee17db2f64…

MALICIOUS

PDF

97.1 KB Created: 2021-07-16 15:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: cdf5e9a795fd8de6e6f84a56c05b6483 SHA-1: 9a37b1700cc48a181108d21b6a01b40d034f7ec4 SHA-256: f8782cee17db2f64e1a74bbdc8724b5f2cb45a7dd272671c5395f7d2a5645df3
124 Risk Score

Malware Insights

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

The PDF file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. The presence of multiple links, including those pointing to WordPress upload directories, suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3428

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 http://mfcwestenkwartier.nl/beta/userfiles/file/45187279939.pdf In PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7e6f2e8685---34639431607.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/vemopawa.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762698b5ae5---32129745498.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d583624deee---muwufun.pdfIn PDF document text
    • http://davcpundri.com/css/file/76371021563.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/bufedoliwazatuxip.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/1k34dmdnkfes3g6dck5aaio7ed/31781245827.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/603f0ef5c807910c7d09e75b4f061065/60151738581.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075e44448ae8---45243440119.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/a565c5d4496e00e1218b2f96c74f2968/48900139739.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/duvulij.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/59398509434.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/tv0bppeldl4l9o84m0brdj1vv2/28452408842.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/960f16fa1f1cb1617f2c4ee9b514fa71/nisojadujowosukiwiwi.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/dirik.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/gutogadob.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/ee61b0e8f0b01895428ebc05852acce8/gezenoginemoxegudunem.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5af234b6f9---pimowukiribelol.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/632e3b311601fc040f3722c1b8be09e7/rinunijifufavusarubibotuj.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/xasobixenebur.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/bdffe6e1969e803489cf2d844e9f5a26/pubat.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/73953942989.pdfIn PDF document text
    • http://yfatc.com/userfiles/file/bewudidefomumel.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/04f3834b9e9422c510f8c7d11af5ba40/futodukogubevofezebux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=what+are+your+strengths+example+answersPDF link annotation
    • 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_off00012e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14691 11000 bytes
SHA-256: a08b0bd50dd56d634cbc0fce85ad69b3d8b09fdfbccd21f55661f847f17adb9d
font_02_sfnt_off00016012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16012 16844 bytes
SHA-256: 78768148d7307349ee87322e5df6454c3b6b853464ba49d1b2bd979c497192e6