Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fe786982c7ba8ca…

MALICIOUS

PDF

98.6 KB Created: 2021-08-18 07:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: e5c6128f823391f652124746f104c3b6 SHA-1: 7b4eaf2dbf3314d73174cb50bb27b87d560b68dc SHA-256: 7fe786982c7ba8cad2dcef3909d1c1a9de33b402585efd27ab33a5c3836dda58
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 0.9989

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://40parables.com/wp-content/plugins/super-forms/uploads/php/files/dd5a8810185468cef0bc5e7229da6c0b/soduli.pdf In PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/6ec92fb23331cabe8150818d4ae93108/silusadexosesufakak.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/gorubebekuk.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102eb4155aca---dejorabug.pdfIn PDF document text
    • http://dogable.de/userfiles/file/jiregipufavuti.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/61323188647.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050908461673499.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/3eddbface19a26e961a6836eb23514e1/65325100076.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/ratojatokane.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/dbfc706a2f05e8a19a66a4ea7a4c8373/37336073732.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/59108722490.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/d4f6966b87f50853563a1c434272895a/dinumuxuxatuposorilute.pdfIn PDF document text
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/86517025758.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/81250262674.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/benopowadiwuxeranosabij.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/xadavexulusag.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/f999b123050744055cc7d288f5b16a05/18166602867.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ph71ktjr96ge78mb7koqa0o26p/64141253865.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/5641ae760c77abeaa56aa4c21a5ca784/xakenidonidisixakex.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/e39b014d6343627a5af63b0dbdf128c4/87138820737.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4985f0568---sonejoxanuzekitemu.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/27095004372.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/togotivolexabaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=tirupur+exporters+association+members+list+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_off000117da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DA 11088 bytes
SHA-256: 054eb45dbf7c7246d19f79a0327a64c163ad684fc4f4e32b76142ad2253c0ba3
font_01_sfnt_off00013175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13175 18436 bytes
SHA-256: 7a04bbdecc2ab772260fd964fc9d6ce61285c0776cbef000390d9a66ad0b5c46
font_02_sfnt_off00016215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16215 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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