Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2083a510a5f5c29…

MALICIOUS

PDF

77.0 KB Created: 2021-08-18 08:35:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0a164b139d4dd9d2984d61cb65d805de SHA-1: 338e63577a352806269b541d6082f142ac55f7d5 SHA-256: c2083a510a5f5c295d12c8e1beba8034fc81166814e544e9ad7e0ad0780a7e10
96 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, and the PDF contains a link farm pointing to numerous websites, many hosted on compromised CMS uploads or disposable domains. This suggests the document is intended to redirect users to potentially malicious sites, possibly for SEO manipulation or to host further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://sage-chem.com/image/files/20210809_015233.pdf In PDF document text
    • http://ibiforstarlight.org/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/355849755.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/redodizapuke.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/54376398712.pdfIn PDF document text
    • https://ancoraeducacion.com/images/37155634766.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/98434884770.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/51219118754.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f21bdd2ee---53106400144.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df828b4b9d4---sifefetu.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723a9d14eac---jewokejiza.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/zarotimol.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2c0827afb6---wesani.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/hgio4doqsqvdue90u73esb9hh5/50221052268.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/55562655574.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161149e1c78044---vibepig.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/70937708009.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/00b9da925230802719b9acec59f9c79a/74949191981.pdfIn PDF document text
    • http://drironcat.com/images/file/sojutesuletukup.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/78778764969.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/qvla5h2okqf203pe4625joa5sp/sifozazofaneru.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/c834bd65385cd3653ad2213d30d0d01a/wotozoti.pdfIn PDF document text
    • http://fdceta02.fr/catalogue_dynamique/file/25178133630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=download+film+warkop+dki+chips+full+movie+mp4PDF 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_off0000c6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000deb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB8 17008 bytes
SHA-256: 2239b18e5ecc08a5c116a4dd854e85bc9ee6ec2ff419fe766c80cf2f09afced2
font_02_sfnt_off00010b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7A 11212 bytes
SHA-256: 29ff2277214bc91ae8d08f3cabbd3df4bcf8e5fd80db07242f7bd0ade5e51eea