Malicious PDF — malware analysis report

Static analysis result for SHA-256 a066e433f546b677…

MALICIOUS

PDF

84.3 KB Created: 2021-09-06 18:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5fc8229074bade78d5116e42bb3a06cb SHA-1: 4b766831c64341b1172f04bf263f03e52c4dc776 SHA-256: a066e433f546b677c049d19300b3f188ed4e170060def0b12d9dfd87890549d0
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other disposable hosting sites. The embedded URLs suggest an attempt to lure users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7908e0aeb5---zafisanarazewexev.pdf In PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/ab6ddbb46674376d6fa0d42604ca2513/xisakodepotozibimatafol.pdfIn PDF document text
    • https://mfdesign.hu/files/file/73206241351.pdfIn PDF document text
    • https://j-kowalewski.pl/uploads/userfiles/files/23347700838.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/85472970378.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/muwepesuxuwofufedipovipun.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d3c9e0aa4---subun.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/32015860889.pdfIn PDF document text
    • http://coopmong.com/ckupload/files/64133849285.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081f74074e32---55018073960.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/0550e00d00a8a2d35b4c3ab25727ceea/xuzorilavutiw.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1610b10914b9ac---pefegunoto.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210823175919713306d1h1k.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/gagapalifuvebonopenoxel.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a147b9e4f90---3620170651.pdfIn PDF document text
    • http://erdbau-rauch.at/29200732135.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/u1f7pctv94ksf13a3qhpo4kudb/fikagusuwu.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/ed3090c35ce2517cf62ae3ff8d2bdaf8/32258124866.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/tupnhnbl2njfivqkkej6im76i3/momugeb.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/dosukejosalepogav.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a5a52def2---tegomapadaritakopijuxajep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=xr150+dmp+user+manualPDF 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_off0000e476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE476 17888 bytes
SHA-256: 8f163d7d29a52b62d4f3b47ed3e05915644b3372401a13a155d24e1005005612
font_01_sfnt_off00011317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11317 10660 bytes
SHA-256: fc14aa0f94bd786f7d9bc97c57bf88c0116f384c08ac97219788973a7c28fbcb
font_02_sfnt_off00012b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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