Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb8139086009104e…

MALICIOUS

PDF

86.7 KB Created: 2021-07-19 22:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2c67939e086e904ec7a7f6813d30bd6c SHA-1: 1f56db8c6384d069578daf8025db9b461b55c187 SHA-256: cb8139086009104e5a5d104ce09e87ec406a20f295442fac4961ae3e6a8d9236
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting it's designed to lead users to malicious content or exploit kits. The presence of link farm techniques further indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835fc18436d---wesifazebuvivixubifajesap.pdf In PDF document text
    • http://freewest.at/48148687896.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/5ct1o59kk15i4i2oapo4ktju1d/39402250758.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/kakewa.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/zumojuje.pdfIn PDF document text
    • http://quinta.cl/upload/files/vonunazonuwixamabosi.pdfIn PDF document text
    • http://tingyi-bnb.com/CKEdit/upload/files/9920875370.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/2ac4183ea3793e41582fcbea54ee1116/jakixuzu.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/88169282357.pdfIn PDF document text
    • http://katheran.com/clients/55933/File/jesosokalasor.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/kopexizikujuxojelopus.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731a79c2a7b---90516431200.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/3c68a769f4dec94517db6232c662111a/keripewivunud.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/pikeredenitobukewatigise.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1ec60bbb4---zikelevuvevusow.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160e468693065c---52358476076.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/970b1f3ce732027c178701f96ee89d84/25368829806.pdfIn PDF document text
    • https://diphong.com/uploads/5392993905.pdfIn PDF document text
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/rizuromukazek.pdfIn PDF document text
    • https://capecoralliving.com/media/file/88522889324.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa91a08d092---lunebezebosapawa.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/nokur.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868439d875d---63281934108.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/0b9567b9cf5c778e3b9d5fa6e5e14d82/74865855311.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082d53628565---ludimalesezuwirolozu.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46415211580.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=university+of+social+sciences+and+humanitiesPDF 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_off0000eee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE3 11028 bytes
SHA-256: 0fa834c897f406df960cf0cb4a04f1a7c7c3badc3c10a07e58fc7cbed3761ea7
font_01_sfnt_off00010867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10867 17144 bytes
SHA-256: 1cc95ef3ce5524dc6c914087ca0f70dcfd0390daa477008d2f5fe0b105bc703a
font_02_sfnt_off0001355d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1355D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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