Malicious PDF — malware analysis report

Static analysis result for SHA-256 23e17e49ed60cdbb…

MALICIOUS

PDF

76.8 KB Created: 2021-09-20 11:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bab1fa516f7c400c17dfc65ee8a70a19 SHA-1: 942856b83a86dd77b3150d246f1ef010a0cd076b SHA-256: 23e17e49ed60cdbb4a196120436103837c95825d14193d0a9afde168443a79d0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection as 'Pdf.Phishing.Trojan'. It contains a link farm pointing to numerous external URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings indicates a strong focus on external link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://uslugi-ogrodnicze.pl/pliki/File/wagadatamuku.pdf In PDF document text
    • http://alptw.com/images/files/17908632967.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/jasatirakasapegaka.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/palutobixixafesedajonevo.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021932154522887.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614062b80e155---xikotemopolapep.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135fac849c90---xawanozol.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/xizinosazugizaguja.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/8cd2ceaa1c865ebfbb70dad3892aa5d3/vubevarosorevasawujox.pdfIn PDF document text
    • http://ombs.ru/uploads/files/10183396978.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/83801438971.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a8fc49748---33922905540.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/1850162949.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/temowovodinutazen.pdfIn PDF document text
    • http://intertravel.hu/_user/file/wizekodadonetewipiz.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/91442149692.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/tetapevatavodesezedurigun.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/zadopoziwikekibasigife.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/b11ecc1be206f415a55b2b15d1e553f7/13115253404.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/depetazi.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/30502172314.pdfIn PDF document text
    • https://media-get.com/userfiles/files/zuzawup.pdfIn PDF document text
    • https://rossbeede.com/userfiles/file/fagerupejowibenexupozu.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/85850601533.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/mumezexumono.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/45331645425.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=1v1+fortnite+simulatorPDF 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_off0000c848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC848 17312 bytes
SHA-256: 505d5e659399ce53eba4fbbfc4e9b0f6acb9f57354c6a75edfc2e2f19ebb2ef8
font_01_sfnt_off0000f5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEE 10496 bytes
SHA-256: eb58a1194f27e341a80ba679a551afea3cd516322fe357877cf5ae86f9a5c7b2

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