Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5a0a64f93c18f41…

MALICIOUS

PDF

69.0 KB Created: 2021-09-09 06:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f415b15ca869cbcb33bc8a774496811e SHA-1: a08c4f0dd2b8f3f3654c15b23d73064740c0bbd9 SHA-256: d5a0a64f93c18f41b0de38f5e690275dcf19f3e2e475005258d3be6080685cd7
176 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various external URLs, some hosted on potentially compromised WordPress sites or disposable domains. The embedded URLs suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/kadifokegeduratigepome.pdf In PDF document text
    • http://ihdbd.org/upload/files/86085801059.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/83352489876.pdfIn PDF document text
    • http://vln.nl/files/file/26267575991.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210903_235403.pdfPDF link annotation
    • https://basisangka.com/contents/files/63697544286.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/71f6c12d5afbcfc18e7b34d2c1049c79/31246540741.pdfIn PDF document text
    • http://susutour.com/userfile/file/liditirunepuwubutupi.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/nenunolax.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/kosevumijoruvoge.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/zinaxoxotereb.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1630863443_8b4ce85c7b.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136167e550f9---91542841820.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb6f8be50e---72984693464.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/59929831416.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jawijupifimaramuriza.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/6933735251.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/546878489.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/sosilimazefelawobazudubi.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307b7f74048---80476461523.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/72479158581.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=windows+11+run+android+appPDF 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_off0000af23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC735 15804 bytes
SHA-256: b082f93674a7a36e2eae617928e16c2cd7e580804843dc9ec448c1cf942fda25
font_02_sfnt_off0000ef8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8F 10340 bytes
SHA-256: f7324064dde9b2392018bf0cf8f50d56546dc7f724761b8798e3df0f25a4680f

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