Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa2335a1bb18abe2…

MALICIOUS

PDF

82.0 KB Created: 2021-09-08 21:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 45a604538a7c5b0a85b99447fde17197 SHA-1: dba165999c94bc66a6f111906f2fbadf397344cb SHA-256: aa2335a1bb18abe2ccde2d7965f8c6f87664e7706cda1b7e3ee818cb0d91506c
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=isometric+pipe+drawing+pdf PDF link annotation
    • http://noahmission.org/dataroom/file/pedulikulunumanoniru.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/41377067424.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/92177074678.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/97861766883.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161355bb957a67---23593405981.pdfIn PDF document text
    • https://dcimx.com/files/16789841100.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/16856031718.pdfIn PDF document text
    • https://nexapos.com/upload/files/loledubulebozilasasiz.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/d182767aaaab0966e711770700a44b9f/66820720471.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132f60c2c205---dukanufuwikefodadibotu.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/81818433751.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/zonapemukuluroganobuxise.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137eda1a074b---84670575451.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/gufudagolikizowefekodeg.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/59235854476.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/kutuvebixowijubepe.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/22984221809.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/23929418199.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/64864821520.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/1491761975.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/99834532535.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/78613805021.pdfIn PDF document text
    • https://digireg.at/upload/26699832202.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/fuvata.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/likogevasisiwapuwam.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ae76b7b36---renileloz.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/dakexizemanu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4F 10956 bytes
SHA-256: 359b9c7fa085ae2d883ab812d3ed7e09f1def813d0a24a418dc86228d5a9e682
font_01_sfnt_off0000f690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF690 16768 bytes
SHA-256: 1022b637075c3a15defd2a5d157c56163c41c167dfacd4118c03b5e194d5956f
font_02_sfnt_off0001221e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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