Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ced192814240ba…

MALICIOUS

PDF

85.9 KB Created: 2021-09-02 00:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1d8c69b48bd8594578ec53e0c3b9d5c9 SHA-1: e8b825a2cef843b0b612df361fa51bd2bccd3875 SHA-256: c3ced192814240bac37ff3bcf3ec66ec783245d46f9b0afee815242d9f03f45c
104 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=3ds+max+2020+install PDF link annotation
    • http://glina-master.ru/admin/ckfinder/userfiles/files/voduzose.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/sovubirarifarezeze.pdfIn PDF document text
    • http://gerocuki.hu/user/file/bilasovumurugitonozu.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/78713520099.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff7bf6c8aa9---dudonodofupuziwakafupok.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/e76c04ef35df8bdf01ecf7acef980f9c/pajigobenurupuvinu.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096097eefa7b---juzijukuluxowi.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/rixugoxigifufagibuzuw.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094e2c390aa4---kejujaxigafexepurafi.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/31456571095.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/wugavatupira.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c09a1c1db---77807910554.pdfIn PDF document text
    • https://avenue102.com/uploads/file/pitovanojosu.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/begegadenetigalubepigu.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3c0b9c11e---robive.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abef0910f51---62159647279.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077399182281---3269877316.pdfIn PDF document text
    • http://airlineclassof66reunion.com/clients/c/cb/cb51827d251551eca15067b3b23580a4/File/masobozujamuzasimisowovud.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/78464574017.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d38070c5784---44885824112.pdfIn PDF document text
    • https://purefeeling8.com/data/file/68256638326.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1226e92289---80138166546.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609834b240b9f---xekifaxanudum.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/17506179109.pdfIn PDF document text
    • 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_off0000e2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC3 10476 bytes
SHA-256: 9efd8d94cd4bda8a954d4cdfc6fafcb1fb4b6f5d637c2aebbe61befe888d1874
font_02_sfnt_off0001128f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128F 21720 bytes
SHA-256: 3d676105afa4d966c4691cfc9a2ae8799525c9d4aa86eae6bb5b024e8a951421

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