Malicious PDF — malware analysis report

Static analysis result for SHA-256 36e8b4065861a39e…

MALICIOUS

PDF

79.7 KB Created: 2021-09-04 18:37:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 32212a19195eeef10cb7fa228854cb57 SHA-1: c142c8c462ee4c7feb02055fda352aaba160a110 SHA-256: 36e8b4065861a39ecf0f01a650f298168f647716db3dab4f89b57294e09dfbfd
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites. This suggests the document is designed to act as a lure, directing users to potentially malicious content hosted on these compromised sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely involving phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3603

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608559373adad---58057338362.pdf In PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94248916599.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75764140528.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///12773862889.pdfIn PDF document text
    • http://piannocreativo.com/js/new/fckeditor/userfiles/file/22573204168.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/83611755268.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/553b7665a6320113898a6fd7df455d25/92131835688.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/11957482160.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/42622526070.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/situbedamizibebupubela.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/zanamafuxarivad.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/xogabifusi.pdfIn PDF document text
    • https://hoongnau.com/upload/files/99489987804.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/gijamukimezud.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/147e302b168c9366c8bf2bbb604f1596/82184857417.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/riribekejubedekar.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/240447376447.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/53073185570.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a770952b5e5---74275311155.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ec38c0fb6---10645318760.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/pusulupuvowoviwesojetapix.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/38415093019.pdfIn PDF document text
    • http://metall-press.ru/files/52189531940.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/028f8fbdd2dc3ddf75b2ce7fd9557ea5/morukotelegefazisus.pdfIn PDF document text
    • https://starbox.fr/img/files/xipopogel.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/87e582088430a4c1d736225c22649c75/4580879832.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/menogiborif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=detail+magazine+online+pdfPDF 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_off0000dafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFC 17720 bytes
SHA-256: 497c63f7179cc2f2ff91bdc925f20f5ef24c9f7d26231d678e63c00adae16e77
font_01_sfnt_off0001092b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092B 10636 bytes
SHA-256: 74d40d9589b60be9989674ac81b7c966b4470977bf77e9668067dc5cc4e1ae4f
font_02_sfnt_off0001213f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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