Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdd117869e349e1b…

MALICIOUS

PDF

81.9 KB Created: 2021-09-01 02:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b740fe3ef3e2c2f3959c0d388afa7842 SHA-1: a474cbf6c81782955b20fbaa3132d9d183215dae SHA-256: bdd117869e349e1b8d24fb38045a46c43ef70b94fc4460238045974fbbec02d2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm used for SEO manipulation or to distribute further malware. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially exploiting vulnerabilities within the PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://caycanhtuyhien.com/uploads/image/files/28650529918.pdf In PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/63664366933.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/tatomoj.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/kirabexamanezuwuj.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/8677451602.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f311d13c6d---gobevotibixolener.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/82145486637.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3cdb3601752e80e85ae6c0fd45e5bed5/patadutatajufebevanali.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/83188371504.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/61169669862.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/sukife.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/xekifajutewafukudogepevu.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/kesobuv.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18396445362.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/bafupowidukigimon.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/xumutilafijewita.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16109677b6f858---rowuzulitusuputesidixeriz.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/42d99ef66cde626c2045af6f08044b90/nonirinidikifajukonagiwes.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/xudimugom.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160adf04638f2c---wekenegufo.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071416be167e---lumuzutow.pdfIn PDF document text
    • http://designgaleria.hu/userfiles/file/xegubukipuxozikimef.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/56490239359.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/3tjdd7s8c4mflnktol0mlh1sk7/26566102180.pdfIn PDF document text
    • https://interface-graphique.com/upload/editor/file/65460822281.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=reading+a+spring+scale+worksheetPDF 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_off0000d9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FD 17620 bytes
SHA-256: 5cba38487e25be6a9dc60c7f9406fc59175d546021099d05c34d1866d713fce4
font_01_sfnt_off000107fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FE 11016 bytes
SHA-256: 420952c4bed6394e2aada1b8649b0bf9063de42d7673bcdad81a1fb4010344ec
font_02_sfnt_off0001215e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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