Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0cf7e38dfdbbd6f…

MALICIOUS

PDF

90.5 KB Created: 2021-08-17 15:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a3703b52322e00299076778cb419d98c SHA-1: 3ddd6d2f44a5854865ca888c7f15af6fe4ebf3dd SHA-256: d0cf7e38dfdbbd6f8a2158aff3786cc7123d67c99714db049da775cc209d42ba
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous other PDF files hosted on compromised WordPress sites. This structure suggests the document's primary purpose is to redirect users to potentially malicious content. The ML classifier strongly indicated maliciousness, and the heuristics confirm the presence of a link farm on compromised CMS uploads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/191ec3bf1f4f1084024715717b7331a1/76080809790.pdf In PDF document text
    • https://powerliteaac.com/userfiles/file/kizapivi.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/b8944584a6d320a9d82a2e8f6d076112/bagomuvidefurinirexalo.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/008647cc3c3d97818da913d8dfb51c42/50400635436.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/falubizubo.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/22800195061.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/2c6ca620d922ea7b22bdc8236f6202dd/fafesewemaz.pdfIn PDF document text
    • https://t2sc.me/userfiles/nodipofevamezarexiwigu.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/84570cd67517d1ecf7abac016c97ba0a/29167474803.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/c464ac3734dafb958e99f2145c685b98/samojikobofu.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/tidogo.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/foguzemusuxixesikawefa.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160850e6693390---48883866646.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/lusivexuzojavogotesatu.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/c8cef076932fbabb789f61df3e860f5f/14480963475.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/vinefetajifuvaxuduz.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/b1e9e391cd17c5408656a295066a97b1/81912353757.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/bevuforuzeji.pdfIn PDF document text
    • https://mm-podium.ro/userfiles/file/38023676422.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/gizexodonexaxawegod.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/zaletodamaxirafulitetixok.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/663fc44eb3df5c6e7f7ce4ac42d51d2d/nolivag.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982a791d0d9---jusuzitubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=shark+navigator+lift+away+deluxe+parts+diagramPDF 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_off0000f61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61F 18372 bytes
SHA-256: aa47faa5e0510e5e0b52459b97cb516b2ac8f12b28b64fc4aefa92f65f827c89
font_01_sfnt_off000125a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A5 11580 bytes
SHA-256: 234204a7bffc192561c7286cdb4b970ace2be503d7623ee948ed5f6af318a307
font_02_sfnt_off000140e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1