Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad8b25053eb89a05…

MALICIOUS

PDF

92.5 KB Created: 2021-09-03 10:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: cc01c1f5f961b66e1f67c91b16211649 SHA-1: fbeb77bca4f14411bafca348004d188f489fe7ed SHA-256: ad8b25053eb89a05e4ccd590aaa467ef740e7947dc16c82a60dd559ccdae6f52
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 0.9923

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://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/tf0eu1a87jhdm9j3o9lqsotk55/63822733013.pdf In PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086279e05fa8---78690309001.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/161000e522dbab---86040555856.pdfIn PDF document text
    • http://temple.mo/userfiles/file/82713202096.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/4a1bee7cb751df184f746c11e7ab0401/lusopobu.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075e790a21b6---9221920583.pdfIn PDF document text
    • http://quaint-house.com/56970143599.pdfIn PDF document text
    • http://shesob.com/file/files/tizodulivepabapiraro.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/defimafi.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115ff1a0350a---tisepedutevujunixej.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/1322045707.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///larorufo.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb965afeab---milaruzinupenubuzowevofi.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/857663460470f5d4a33707af00a1a0b7/bapikapuxejejefug.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/1f2f2010009419c0a7b355252a18fb20/japuzuvif.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/novatomumapuvusuzetilamoz.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/kuraxizikef.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/2058a460902059bf004894def13e81e8/48244092591.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/bamowigupobi.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607decb50e17f---xevetulazedala.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/afd1de541bd22bdc446f338c9bca88b1/38102677621.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/59576265187.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/pl4p54sbrr7fa28pnvmd11icpq/doradowifapowikasula.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62766418158.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=difference+between+computerized+accounting+and+manual+accounting+pdfPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/66311775165.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC95 11180 bytes
SHA-256: 5a8a77e8728d09da708d68ccbdc1d7025e1a3953880d1eb48e82a9220dbde68a
font_01_sfnt_off00010660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10660 18388 bytes
SHA-256: 3738f97daa56766639de04f880eda662a59a9dcf248e14b1f31e254f91ba165e
font_02_sfnt_off000134f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F8 16152 bytes
SHA-256: 0f62411f33c11177563efe33ebd0105f37df2a55e6a92cd5aec3f2cc21bf3838
font_03_sfnt_off00014a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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