Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb0d83e663d45f8…

MALICIOUS

PDF

90.1 KB Created: 2021-08-09 06:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 83e738257996574b415bda9f4601a70b SHA-1: e84d931f707954055401d4e203a029a606c2444a SHA-256: 1cb0d83e663d45f85a4aa2b146d1d2e1d3cde63b95680e112969050286434b50
96 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple compromised WordPress sites, each hosting another PDF. This suggests a multi-stage attack where the initial PDF serves as a lure to download further malicious content. The ML classifier strongly indicates malicious intent, and the structure points towards a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/vofb2qmdb1u2fqsi7agbk52au0/ratikabo.pdf In PDF document text
    • https://tempegaring.com/contents//files/kukoludira.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/c86ac797d06434d58ed8a165d3fb0f00/fifaponovopefow.pdfIn PDF document text
    • http://dringraldi.com/clients/7/73/73ccc230e5ee2b020474e4a43bcd07af/File/bomejuxudabafavu.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/79d66ab6e9510472de5d3c462a8ff70f/jidew.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/8e79686d7f8ffede7b9e96b46b10ff1b/botaduv.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/nanep.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/xumemujifogazu.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d71e51647---towakegikubek.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608492e412099---jojararabusoginebosot.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/n3l6ou3paeptshfgboou9ma7a0/70637032538.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/477f254fd5e547305c07f6a951482700/55015133723.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/gomawisig.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/89401562077.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/69519141019.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/1baf908fdcac6cec2eae2be75408115c/43151590554.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/70683627944.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/ligosirugebozipufinaj.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fec3217d39---xanutuneno.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/0ed17f28c5d1d50d56f91fd118e77a8a/35398989223.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/0758db9f931d982907765d0f336a6dc1/3303022171.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/2tv9gdek3ubdq7q1elv43deipq/59277224865.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/26140106984.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16094755070d03---11823693897.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/sevakanodakin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=9.+s%C4%B1n%C4%B1f+fizik+madde+ve+%C3%B6zellikleri+konu+anlat%C4%B1m%C4%B1+2020+pdfPDF 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_off0000f0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D2 20812 bytes
SHA-256: 1dda70719e5f865c101c3fbc63e2d67ac53b41e6451943ddefd604f5cad4ef73
font_01_sfnt_off00012317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12317 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B2E 11616 bytes
SHA-256: 9348abad3d6e0be8dbf3ef3f8726988dc85de198122b145961b334eb72dd9a9c

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