Malicious PDF — malware analysis report

Static analysis result for SHA-256 1393160385889e06…

MALICIOUS

PDF

89.6 KB Created: 2021-07-18 03:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c772891bf3ca7abfb260a91dc6a99bc3 SHA-1: 68dd452a647ca4fb64f871bed2a54c180b06a5e4 SHA-256: 1393160385889e06f1e5cd1e52c17c52cc891ea385db72ec1aa5acdc2e47a154
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting it functions as a link farm. These links likely lead to phishing sites or further malware downloads. The presence of multiple compromised or disposable hosting domains indicates an attempt to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774d9d4d0db---xazajireboviwomoxizinepal.pdf In PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/3eklngfg333u58pidpr2nelsb5/woforakapaminenoxefubad.pdfIn PDF document text
    • http://goldmustang.ru/files/files/gewokipugorur.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/98106963185.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/qihqds5hkeifofuerunhe7r5t2/32247370752.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/718260043b134daa45ab2e3196f4f76c/babagibojivezeguwifetaduf.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/83709552490.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/rawowaxefelowetatutaverel.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e95327d39e---mabezupanurizezevamovo.pdfIn PDF document text
    • http://huiking.cn/uploads/file/252048411673.pdfIn PDF document text
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/53672263539.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094b13b1c330---gibevaxobipawawawosa.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/49731679403.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/71924660797.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/7037711693.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a798c104d---90162522767.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ad8b3800a---50810607101.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea8b0a6831---24134412890.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/83478904203.pdfIn PDF document text
    • http://greenld.com/userfiles/23386527022.pdfIn PDF document text
    • https://castel.ro/userfiles/file/61175565783.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images//files/62410694740.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/a9a46966d2894b52f0801e957c417ef8/44873351302.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c45576fdfd---6280796758.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+write+xpath+manually+in+selenium+webdriverPDF 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_off0000f5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E08 11256 bytes
SHA-256: 8db8829b22a384abf78d5924bc6d323006ec983c4f69c7dfe19dafa1009fffa3
font_02_sfnt_off00012810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12810 17728 bytes
SHA-256: 0c4098eedda5594055a84135ce2340e8f487c57f9363a48365411c102ff2da42

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