Malicious PDF — malware analysis report

Static analysis result for SHA-256 70575a260709672a…

MALICIOUS

PDF

82.8 KB Created: 2021-09-17 19:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fc4de8a520355b0d97d10a5a553dbe5a SHA-1: b181d4424665f4566f1d3e839e8b178aad924592 SHA-256: 70575a260709672af1d73e0d302edeb01726e224cdd7da4236dfdfb9db416183
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple external URIs and a link farm heuristic points towards an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.afoa.org.ar/backend/ckfinder/userfiles/files/12064453092.pdf In PDF document text
    • http://mansiya.com/uploadfile/files/57562508726.pdfIn PDF document text
    • http://esangsok.com/upfile/files/45635790822.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/14952141705.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/40537139175.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/42642036492.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/nefes.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/36277553719.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/64456519056.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16140ec33b7e22---38418330215.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/frb43olmb689ko0rsorsej72qc/51657388193.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b6293ca9d---fadimiduzi.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/ralafixadu.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/65d06ceb1392432a3194ce9c343bbcdf/86112352659.pdfIn PDF document text
    • http://dinhvi5s.com/images/newtech/files/94472490883.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/jawobebif.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397d9ea77be---gawuk.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/59221275609.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/gofadememalapedafobiba.pdfIn PDF document text
    • https://safarekhoob.ir/basefile/safarekhoobir/files/16309142537.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/3602440181.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/zopabekaluwuzobepu.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/51371318007.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/29494840916.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=httpurlconnection+java+examplePDF 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_off0000dbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAE 18508 bytes
SHA-256: 7db95fee3f95d1dcc59f0a5b83a636e311190de39ee962a8279b6e5d63557a79
font_01_sfnt_off00010c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001248a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248A 10756 bytes
SHA-256: e3986f64ef7fbeea433e4942b77c394397fba020565184c1234b63072eec1deb