Malicious PDF — malware analysis report

Static analysis result for SHA-256 aacea494478ee63a…

MALICIOUS

PDF

85.9 KB Created: 2021-09-05 23:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b97a186dbe5830129d8add74f14a7775 SHA-1: 43a9692f3ad4cac23dde6c0900a12d45a5c730bf SHA-256: aacea494478ee63ab26e1755592445c6331101e920944291ead3fdf0fceb23c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests links to compromised WordPress upload storage. These findings, along with the ML classifier and ClamAV detection, strongly suggest a malicious intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://khyljg.com/uploadfiles/files/sikosavosulufusunaga.pdf In PDF document text
    • http://innersolutions-uk.com/file/44217703826.pdfIn PDF document text
    • http://carszana.com/image/upload/File/63576684741.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ad2cd2a45f---lovosakududedulugijetifir.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/taxavufuzi.pdfIn PDF document text
    • http://dolupin.com/calisma2/files/uploads/xusimamerizanoru.pdfIn PDF document text
    • http://dreamscar.eu/userfiles/file/43311710251.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16239473491509.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/2210427512.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/c528215b92d4a91bbd32f3da92ba430e/tunebikiduwa.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/bf0298137f98bf0361f7e771ba82e862/9983596002.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612c047eaf5dd---89889623108.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/bupirom.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edfc165f39---wogepavapafip.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16097c132afb16---wakerefutodiliruzozaw.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef8ae7def0---62540314935.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608157d3dfb06---96302488743.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609b33dfcb806---4551046878.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/31098613481.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/vupodewijijavo.pdfIn PDF document text
    • http://fedoro.ru/upload/file/fedewataf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=climate+change+esl+worksheet+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_off0000e8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C7 11276 bytes
SHA-256: 0b20496e0dc48a65d8830d3fb5367f67df60f2403dedaba44ea27d4584d222b9
font_02_sfnt_off00011ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE8 18364 bytes
SHA-256: 244acbd08832586acca41d815cb7823a2087e5ffc6c26b20042c935025d6921b

Open this report in the interactive analyzer, or submit your own file for analysis.