Malicious PDF — malware analysis report

Static analysis result for SHA-256 68ed0001540fc2a8…

MALICIOUS

PDF

82.7 KB Created: 2021-07-21 04:33:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 27ff5a965b6e460a63b1070bf4fda422 SHA-1: 12f28161e1cdbef2406ff1417f5bac0986c088df SHA-256: 68ed0001540fc2a86fa9d868ab3c9902c17d1d328d00b7451104b0271505fc5c
96 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the link farm structure suggests a redirection mechanism. The primary purpose appears to be to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/ab146624d5d99e8a19cd49114df01008/21920316456.pdf In PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/8g9j4e92g5ndd6o820euqgfq23/bibudapebetalu.pdfIn PDF document text
    • https://notrepanierbio.ch/userfiles/file/bomulabuzusujokeliwupaw.pdfIn PDF document text
    • https://zold-kommando.hu/files/munazusumotepiwagab.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/37c15cb36dd6ef70f9772c79060f939e/kavopamuv.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2dcf7b33a---95540288112.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/rojanakiparuxawokolu.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/524c1784a9668d8cdfc3846c92d4c417/duvosala.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/5td4jos0nu26oagro9866h61f8/rajumokeguvisag.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/1b9ced38c85d9ec5d1009053c1b30e7b/79087925647.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/77550521471.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/41504093900.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c572691a27---lizezezazefofi.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/gudamefuvixise.pdfIn PDF document text
    • http://dlikefulproductions.com/clients/875850/File/geveputoxoko.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/2c1cf65846c59755a673a9ba766214fe/11638167266.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/39242582167.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb94cd5072---86331252262.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/60e9319ac51bdfec2ca6e7dcced382fe/90962039098.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/7333557512.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6dc4cc9b0---sovebugorozapuvo.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/88687464306.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/49872a5efb482c65cc66d2da872b0c42/46413423191.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/wanutotom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=no+argument+constructor+in+javaPDF 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_off0000e139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE139 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF950 10800 bytes
SHA-256: 730d6cafff2ed45ce7fc81bec93df330d36a12c7b8e2ce0df8762dad4a64d82b
font_02_sfnt_off00011234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11234 16608 bytes
SHA-256: aa75c9a379304b2a6c99340bf6fb4919f066c3838b7d762ec9dd67b7f03f9eca

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