Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec9d19004b43d4d…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 10:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 363f8988a4b980c1892d6a9ae979543b SHA-1: 78f7df1a0e5118049e884f1a5cdcef3310e7d360 SHA-256: 8ec9d19004b43d4dfa0c6aefe3ad85d199a9efceb548af3f06ac1e3ef1a1ed0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories and other disposable hosting. The primary purpose appears to be directing users to potentially malicious content or phishing sites through a network of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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 http://mtsskzy.com/userfiles/file/gutonajezuwanawav.pdf In PDF document text
    • https://pesonabali.dswip.com/ci/userfiles/files/51946904790.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/jodobazometadizonulujeg.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f3e995800---67061885964.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090914451947.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/vumer.pdfIn PDF document text
    • https://lasanisports.com/files/34694280394.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/66599997475.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a890f595dc---nasosoninomodup.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/20219112149514067.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/zibif.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4a3fb68b1---6575411784.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/49898129106.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/dekulojurerofakarugixajoj.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/78041069002.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/80196541467.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613667b6dde0f---88204875353.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/73375132889.pdfIn PDF document text
    • http://sofar-france.com/userfiles/file/5579682632.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/70778996428.pdfIn PDF document text
    • http://bptramptour.pl/files/file/49611890502.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/20c7cf9d5d63405af9c07690cf504063/kotegopa.pdfIn PDF document text
    • http://shouce-image.kuchuancdn.com/Public/resource/files/fetofowu.pdfIn PDF document text
    • https://maviet.vn/upload/files/21891428214.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16131020a83b0a---96807181544.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=ur+so+beautiful+in+spanishPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE141 10700 bytes
SHA-256: 84a1bb03fadce1d7126e998ab500d68ff3c17e75fe11492724d7a26a93874d56
font_02_sfnt_off0000f97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97A 22712 bytes
SHA-256: 659faacce75e0a85a64cc35cbb4fe2d9193c13672257e303133aa50780530df3
font_03_sfnt_off00013205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13205 1868 bytes
SHA-256: 9d2bb2d94384256bb38bab4c3005c13f44a8b25eb5b232dcefe64ad24aae4b51

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