Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf806d5bb453fc1c…

MALICIOUS

PDF

83.1 KB Created: 2021-07-23 04:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2295d5a8e8446f5d3e59b2ac8942285d SHA-1: 78e311ecb3e5ee364a1ae28daf9a17736eaa9d35 SHA-256: bf806d5bb453fc1cc85834b57e82c0f1050cb28617a4097e63903c690fa6f95e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm, a common technique for phishing or distributing malware. Several URLs point to compromised WordPress sites and disposable hosting, indicating a malicious intent to obscure the true destination or leverage compromised infrastructure. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8410

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://sbairs.com/datas/files/zozitejixifurugages.pdf In PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/d5ae9f8384fed8cc774e2dcdf3587045/forusam.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/cfdd1d2e8e4a18329336ac86acff38f1/75331790831.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/sugelukulapabubogujirunaw.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/6535f4bf6e63543efdd56901ffcdff61/netagoda.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/28888446737.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/87ca2356cbb1c02fd6a01e281207cb9e/piladukebipetabawokub.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/jisuzetigafotijibok.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/vuziroxe.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/8ecf5598fceea4ccd269a4295924f9a2/26988410330.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/e24ribitl7d12v7m310gmhivll/lelizim.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/09f3666b58b532d364541534940acd63/delobamek.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875c5e9b946---75375323755.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/7754131053.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3f4792b7a---vuzejapeliwurukubirinu.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/fuzetoborafifom.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1621381575.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776737c69f4---24891958022.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/21108883007.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/33661909637.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c389b3f167---21763840745.pdfIn PDF document text
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/xofovijigorudaxavob.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/limujudoxowexopajumif.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/76343561846.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f67db2488---60535418712.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=star+wars+rogue+squadron+4PDF link annotation
    • 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_off0000fb40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB40 20232 bytes
SHA-256: 19e7218b972956799e3f8828d4990d25e1a8dd4f6413e1535e42a5cc3de817e2
font_01_sfnt_off00012f0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0D 10772 bytes
SHA-256: bc53e02a377cba42110039d1562d36b9d956fb285f0db646cf700ec5e8ac3665