Malicious PDF — malware analysis report

Static analysis result for SHA-256 77e28077d5db7b6e…

MALICIOUS

PDF

65.0 KB Created: 2021-06-22 23:38:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: e1a5f9cd6091172f825303626541e74b SHA-1: a97d9815e4b61619ae340c9a7a140b03f0d2900a SHA-256: 77e28077d5db7b6e293ddd8671cb63b8151c9c6c2605338f35bfb69bc5a21969
156 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 high likelihood of malicious intent. Heuristics reveal it functions as a link farm, containing numerous external URIs pointing to various websites, some hosted on compromised CMS uploads. The primary purpose appears to be directing users to these external sites, which could host phishing content or further malware.

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://coretry.ru/uplcv?utm_term=theory+of+econometrics+by+koutsoyiannis+pdf PDF link annotation
    • https://dcoderesearch.com/uploads/notet.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb4f861cd0---fawapixixamibareb.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/1nlah22k7oidijnch7jgaso032/loxuforifoluwijederilog.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16077f6ee6ea19---bebadefixebufe.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/5d9db243e051023a7ed4f6b1b76e6342/50359330207.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbffbdeca8---zefexoxozeruda.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a8d5c2b0f---56234236593.pdfIn PDF document text
    • http://ximangsongthao.com/app/webroot/uploads/files/powoluzanelowo.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/xaxatanokojatetigogas.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file/%5C/52292941148.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/adbf90ed580ac8016ed8599637508099/muxakevozutini.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/47246854533.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/bosokelid.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/25215261626.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_off0000bf49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF49 5620 bytes
SHA-256: 1da2e25ab7f037d782822366bf025e4b149326e384a4708db1596b5bc1f21ffe
font_01_sfnt_off0000d246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD246 11456 bytes
SHA-256: 58f17deb7715f1d339d9698d9bfefa62cf625f978dbc6cc32643dd0ec9c5dec1

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