Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb114a4be6ca998d…

MALICIOUS

PDF

78.4 KB Created: 2021-06-30 18:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b15b79ade7a5faaad08ac9c5bf8a88d9 SHA-1: 5cc4fe3286d7ca97bdc4ccbabb2d1da4a0fdbd9b SHA-256: cb114a4be6ca998d5ac3f318df362d6bb669831151a21ddd4f33f1e8cb3408a8
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised WordPress sites. These links are likely intended to lure users to malicious websites for phishing or to download further malware. The ML classifier strongly indicated maliciousness, supporting the assessment of a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://ketchas.ru/uplcv?utm_term=meditation+music+peaceful+relaxation PDF link annotation
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ae89fd3ae70---wukumenubiriwi.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d7734340d---buguxalisekuxeva.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210626_993F8E706EF94101.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607df4c718de3---befugu.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16233866431287640252.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/nawedejulixo.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9bcf56241---68897518568.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8c9d7c4b6---5857817084.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/s3k6v3nk012v6mjojftm5o18g4/botavi.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/susitemugomedidelomuw.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/1a7bbebe092c57067b2f0221859a47ae/sitowud.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/vijuposukonoli.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/56a4a6def2dea733bf35fcba6820a7be/ganudosotajikitemewod.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/9849d024357eb52efdfcb14dc829f1a1/kuluxunojiwezutezag.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/18296733260.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/mt5bp56bqggkcshep4nqv86kos/88578594486.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/92089793840.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/c33490879ff26a4928bc88af61052a15/76661250.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/9819397351.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607443dc1f1b2---piseku.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d879ddd86da---62145277382.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b76bf840dfb---58504730684.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/19154344987.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d487be191a---15403699609.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719ada786bc---jerixixikirokuvogake.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_off0000cc60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC60 16888 bytes
SHA-256: e9f629da98ed0ade6be0298f239a66df0d369eab05809333c07fd3094c6566d2
font_01_sfnt_off0000f8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AE 10976 bytes
SHA-256: 7f335037e206a90661ff05b3ea8a52e8c9977d0703c5d1dd99275d98997743b4
font_02_sfnt_off00011229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11229 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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