Malicious PDF — malware analysis report

Static analysis result for SHA-256 a24f5f81ff2dfe64…

MALICIOUS

PDF

72.2 KB Created: 2021-06-30 10:37:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 249b336885f96cc8da747926edd5c92e SHA-1: 31cc970d05a102e273c77a8b84afd84ee2567c55 SHA-256: a24f5f81ff2dfe6414ad09dc71488eba17a878854cebc84566f6db862077ac3d
96 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to websites utilizing formcraft plugins on potentially compromised CMS upload storage. These links likely serve as a lure to redirect users to malicious sites, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884010ea165---4692306835.pdf In PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/8499971963.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/tuvabomexazevirami.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/ramolifijo.pdfIn PDF document text
    • https://aneri12.eu/res/file/87470347159.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928dec23153---54983290973.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608179c466277---welivasofafedof.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/65407702530.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfcac36879---68008584070.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/82156895505.pdfIn PDF document text
    • http://4bx.pl/public/file/potigurikoriwa.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/porajosuzemefomulin.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/numexagidi.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/latewibifekuperajajizi.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/nr2r4afjvrkikcvlplrs458d82/zomuwazamolavojorevosaf.pdfIn PDF document text
    • http://carolinaboatclub.com/userfiles/file/81012731437.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/e0c040da7caaf78e167f81acb02e7a86/xugixetivologo.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/gefobefikerorad.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/7860bc5c76837696235acb66129f1acd/xibazinapigunage.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/369699cdb457558ca07ebbe03b674f4e/fasef.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091193939a40---medibizegivaw.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/3p8oen22597r9k4s2qcrvcv72k/65092494605.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/6eac9fec776537fd49a2b41928e514fe/vufapajewebakobubib.pdfIn PDF document text
    • https://blogsma.com/files/depari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=booker+funeral+homePDF 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_off0000bd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD595 10368 bytes
SHA-256: 4a52ca53f436ae14e25ef4e17114b9a8e093649d0ae518da0ce5cfe05ea0826d
font_02_sfnt_off0000ecd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD1 15808 bytes
SHA-256: 2bbb365633dd9442c8d33b4a0f38f12955ad6e2ab49c38571a6fe49e8a7e4a75

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