Malicious PDF — malware analysis report

Static analysis result for SHA-256 6890ab124e4fee46…

MALICIOUS

PDF

75.4 KB Created: 2021-06-05 19:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 1b15720d7b9627dfb2fa851cd3b36a74 SHA-1: aa991cde33ab8de5edbd91ef5931a7b6afda7663 SHA-256: 6890ab124e4fee46145f84c065abc4404f8cdce7174da012d7675221180a612a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm to distribute phishing content or further malware. The presence of embedded URLs and the nature of the heuristics point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=is+ahsoka+still+alive+in+rise+of+skywalker PDF link annotation
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/19a27b0ceb67ad99c248c2f769776e30/65571276254.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/9e88d747db0fcc5292f58b02e9b7fe26/vesovod.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bb29c5f06---kevorurimomazadetinege.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/rebaduxitosiboxeru.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070635be5211---63058064667.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31690e7b58---50355711451.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090f85af14cd---kadotepen.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/tirevabuz.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607b440f7ee19---risisi.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/55909777247.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/jrij9ef82bf03me52m0bdi06pv/kulumadasowuposab.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/90842791133.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/doruxojevusixesiwabaku.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/1983582224383b65aa0a7d006bfd4802/jajokipibamubaxolepuforum.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/luwifu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA48 5112 bytes
SHA-256: 308c69eb534b251b898d178381422eec20b7d398ceba7f602e5060cb73c2aa60
font_01_sfnt_off0000fbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC1 10916 bytes
SHA-256: c833ac656e718ea5d91093493f51d3dfe407060c89f5ca1806639f90c16716b1