Malicious PDF — malware analysis report

Static analysis result for SHA-256 2056ff716d70d753…

MALICIOUS

PDF

86.5 KB Created: 2021-08-13 12:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 6d619f1c7339f37cee9589caca9cc838 SHA-1: 1b5042328d91eac7600ea629731fffc59d7f9d57 SHA-256: 2056ff716d70d753bba8209058e613df164228a79eade4c7d6bf9c64e6aeb8d1
96 Risk Score

Malware Insights

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

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://detmers-kontejner.hr/files/lewazotinijulijulidosup.pdf In PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/2cqu87t959ban806u0ue4rmj8u/rubavad.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/5739656472.pdfIn PDF document text
    • https://gangnampools.com/contents//files/72677747334.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/f603becfb5b390e58460f25c0e0f2c0d/juvipetuk.pdfIn PDF document text
    • http://liyangah.com/Upload/file/53526053149.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd703be2a17---julog.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb23db622e---banulofobibozus.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6a85bc2b4---zamuwoxibefevixevuxukebem.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/39048920964.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/slgl279tl0rijdclt5s1gd7dur/82792295238.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/76654966345.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/1b1de9bbdd6516ef2f0890a586423d50/dafinugopoxizixaxomop.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/213041b59da35e2a6f22e5b1f6bbb481/78013027852.pdfIn PDF document text
    • http://lucann.com/Upload/file/76371018593.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/susebiposogeze.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/714ac31a14879368aae596e6b36e1a60/45110551050.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/vofubujifukozozas.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/bg7rbginkogt2b9dk1pikvo9i5/96719582270.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5da64362f8---nimoxanesopajajelop.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/74320293459.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/okbilds7ckf11moj4c45q245dh/rakifuzoxevulolozetukid.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b769cf955---ramibuvix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=ingersoll+rand+model+2475+air+compressor+partsPDF 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_off0000ed22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED22 17424 bytes
SHA-256: a417c71ce7a9d736afd64e4f7380371677691a39c603bb7638ba7cb77c96a64c
font_01_sfnt_off000119fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FC 11188 bytes
SHA-256: 367ddb0f6603f534d975924d7f42b98f54792b148aafe9246c03f0291647bb31
font_02_sfnt_off0001341a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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