Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebfc97805f434ea9…

MALICIOUS

PDF

70.7 KB Created: 2021-09-09 10:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 645e7e99461f86ffd6d1f40e76e64290 SHA-1: 4b8024a3a03900070c6c949a7fee8af30d9ec5a7 SHA-256: ebfc97805f434ea9b8ebfc05019a1d62bea54fbdcafd46524f0184a1b616ad49
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Static analysis revealed it functions as a link farm, with numerous URLs pointing to external resources, many hosted on compromised CMS platforms or disposable domains. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics confirms this behavior, suggesting the PDF is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=messenger+live+outlook PDF link annotation
    • https://sherwoodchamber.org/ckfinder/userfiles/files/72220820443.pdfIn PDF document text
    • http://jwconsult2005.com/file_media/file_image/file/piselesavul.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/82233796730.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/11281949359.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/wiketiruka.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/supupaso.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/2cinnog9a2j7u7t7dbldoroqbm/biruxuziwol.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/11044824019.pdfIn PDF document text
    • https://thepainter.asia/upload/files/zujijuvepikanezivazutokig.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210908155254.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/lenegukukogizi.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210906080726.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/losofasevesugesor.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/972d5779ad7f5c00f531f18b5b5208c1/nisozabadakaselisolo.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/ganetalotukalekekel.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/kikapajexaxewir.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/72852022489.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/penanubukalegexikak.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/12108063315.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/sodeka.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/9965f0b67d1f25596ef49ac5af9dc953/zepigunebavawur.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/55187250348.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/48656297339.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/jabubelanup.pdfIn 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://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_off0000b575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB575 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8C 10372 bytes
SHA-256: 417d87c98aba548b38d06b84e6835e1ed17aceee437061b0e52f9b9b92de6ccf
font_02_sfnt_off0000e527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE527 15752 bytes
SHA-256: 3d99b885f51205ae1eada612675eeed09a3fb4e5b44b17e94db1fe41d1ecb319

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