Malicious PDF — malware analysis report

Static analysis result for SHA-256 edd9ead707ebe144…

MALICIOUS

PDF

90.5 KB Created: 2021-08-20 09:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1f1e8309bb38a034d50d472e9dd153ac SHA-1: 534d0796e78a7feb770075160cf5e7480742db7a SHA-256: edd9ead707ebe144a22718f12132831c59389b17d07f07c14785049d0c89a0fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely to host further malicious content or phishing pages. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to use disposable hosting for these links. No scripts were extracted, but the presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72c8c53e1f---74983215045.pdf In PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/5nv0r8837jbvvvl0k1lhrpq9ts/paribu.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/efd1829ce1c06e1847401f2e675b0bc0/fadanasabugilawij.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/3c95b59505515cead85c1731cda0b7fa/zaselokitetupenazajev.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/5fd3d3a33acf19e5979caf36e42ff764/17282950171.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc22f6d302---48442832798.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d76f440571a---radarovivit.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/kebarubifetaxira.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075fd5a2d75b---69340014567.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/63679103184.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081646b911a2---sukazizimumalowoposikad.pdfIn PDF document text
    • https://moolans.com/uploads/files/nalekenad.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160acf755890ff---wukideni.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16085e7f909125---67156484095.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1866e28b8---vafux.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc49256f2e---17920920770.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210812_743D7E08D47374B5.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/zujedovoli.pdfIn PDF document text
    • http://bereanbaptistashton.com/clients/1/1c/1ca8668e480cca1e897b6add33210fc6/File/81800586854.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/10115297767.pdfIn PDF document text
    • https://asiajitu.com/contents//files/72662657879.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/82733184569.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/xabitumole.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/9a895a33731aa14f20758db045b99032/82162958703.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/689ac706c83cbd5e0d614549e8cf253d/88835320334.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826f43f30cd---surigarav.pdfIn PDF document text
    • http://mosjob.ru/images/file/26400490845.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=mpow+bluetooth+earpiece+pairingPDF 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_off0000fc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1E 17120 bytes
SHA-256: 9c97fd47c37b05d4adc0cca7b35a7af136c60438314a0386f69797e3ce56078d
font_01_sfnt_off000128ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14116 10804 bytes
SHA-256: 2944b40b3dc3cbeb2f5615955b3e1862b6e43f520265930f3b141d2067372563

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