Malicious PDF — malware analysis report

Static analysis result for SHA-256 297a588149a7ff13…

MALICIOUS

PDF

87.3 KB Created: 2021-09-05 13:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 882a686ba0f5fcb87eb598a240617f1b SHA-1: f840d22605f94bcc3a6805609784b664f33abbd7 SHA-256: 297a588149a7ff13d4abe09f1b49a68ff05741bee1f43e3086bca22cc611cd39
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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
  • 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.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d30386ee33---96315690736.pdf In PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/segeze.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16105bd5c61e35---berixojizomegumedo.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebe9b7e43d---sejavogojadenipexike.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/fijesebijofuduki.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/4448664333.pdfIn PDF document text
    • http://brownewingfamily.com/clients/a/a4/a4d7a48ed280e719b438ae57db99af5e/File/leduzadubit.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/1e5adbc39a5db82253fda5ac64670d8a/57015733525.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/99850889591.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db8078119c2---vonodesukuzexata.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/66057949131.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/a5c3d9200144ce99a33f321cc0ae7e52/gizurifu.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/pegutonizafofowexafin.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0d8c2340d---74090594760.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/7720c5efb0b5d8e5f291e7f702fabdc6/54611398448.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/ecf471dd431b19f154ac38b3c35f5577/21112999401.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609e41935765c---62176911514.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/g4mmv2fbfekjbh91g2dg1seb1q/17178555953.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/egilunog9of1aag2a45qje3648/64650739621.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-7-17/20210717083529826775.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/76967258951.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/99923709521.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/jifenosoz.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/4c169f81c6c21161167b470abdffd0f6/lalubewavaxopibojatuz.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/ruferanujekoladalu.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/giduxinenuge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=superior+health+plan+medicaid+provider+manualPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000f2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C5 16948 bytes
SHA-256: 8bfbc771ad5b5d6e68bfb0d9219215364c3827a6d7bffa6d535bd33e678ace96
font_01_sfnt_off00011e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E92 10852 bytes
SHA-256: 65f4eef7173e90ae3ab228c333232d0ae9c1ee0563dcd3321332a80a5af5b919
font_02_sfnt_off0001376b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1376B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1