Malicious PDF — malware analysis report

Static analysis result for SHA-256 f511c4a96196bfb2…

MALICIOUS

PDF

64.0 KB Created: 2021-09-28 10:42:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 18c773887130480f440afe4967045715 SHA-1: 5966a7a138b73c58807504d375ac92cfad25e0d1 SHA-256: f511c4a96196bfb2b6052b171f8bbc6a37262522a82162379e83a38fc0bae4f2
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected by ClamAV as Pdf.Phishing.Trojan. It contains numerous external links, many hosted on compromised CMS upload directories or disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the ClamAV detection strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3962

Heuristics 5

  • 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.
  • 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://laborke.ru/uplcv?utm_term=best+video+watching+app+for+android PDF link annotation
    • http://hotelgiottotorino.com/userfiles/files/logewogimojaz.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/22880744832.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/b3c06348fca311854fcd9ee790ff7bf1/lijelizu.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/54592156073.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/buxebuxemetirazufagote.pdfIn PDF document text
    • http://malifer.hu/upload/file/26439480372.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/fisafu.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/lisaduw.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/puxetizijan.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/fobilo.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/dodupabifipawakerow.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/rumunawebame.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/0e92f19cb973d3bdc2c560406b857dc6/kizox.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/mubozujibu.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/0e61be4a877cda55c9d6f887979c8ef1/kijokagixagujir.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/db126ec6be5f46625744c2055fa410ba/rizegabaxir.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16148cb26d7d4e---nafonixula.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/29306907035.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/50368560416.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/33111880597.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/3265918117.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/74764652863.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/14650950666.pdfIn PDF document text
    • http://jutaek.humenia.com/upload/userfiles/2021/09/files/210916041258.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/45715398989.pdfIn PDF document text
    • http://napiarsaigh.com/images/57460089222.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_off0000b478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB478 11056 bytes
SHA-256: 5890ad9dcc77d25ec2839c6cc6cbb4d3e5a95bd74bfbced6acd8d34dbea6d820
font_01_sfnt_off0000ce14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1