Malicious PDF — malware analysis report

Static analysis result for SHA-256 634694549c51d3f5…

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 01:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d0098b437fd2bd8e7feb7191f6e6efe3 SHA-1: 4f2eabe111115ce49a515e02728eae5d87ba56b1 SHA-256: 634694549c51d3f52c42e22b795a1474e7cc1b4c02f503423d187e6f9f2e7130
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://thoitrangvabaoho.com/Images_upload/files/38926013542.pdf In PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/54212924810.pdfIn PDF document text
    • https://whereestar.com/marinarubicon/admin/file/vunedejelolujipola.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/69511834377.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/62351776227.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/b4f706efb5cb83e357e73ebe3ba18897/27375899970.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/sibusomamimivijomekomokis.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/76951165526.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/82579449962.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/84925352692.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/samolinasepepagiren.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/nunav.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/junoxogajanemiwanerukani.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/908fec3e570093f18be77a058dbeaf3a/wonifojanadojozufuzapalo.pdfIn PDF document text
    • http://carbontuning.ru/file/pakuzipigeloruf.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/140355327403.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/xugodofoxinojeko.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139a12775d5e---voxopawodatasufugozod.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/59911696627.pdfIn PDF document text
    • http://om-ar.com/userfiles/file/80298831491.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e71730d3f---45874374806.pdfIn PDF document text
    • http://imbirimbir.ru/files/rusaf.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/xujesumuwimezuzevib.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/29053165930.pdfIn PDF document text
    • http://yuli-china.ru/d/files/12204596671.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/99844074753.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/fepubamobewunavet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=gta+san+mod+apk+downloadPDF 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_off0000dac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC4 17440 bytes
SHA-256: f5dabe0e0bce26efdfb41be537f4ca0621cd24f3c8280514eea44cf585b3b0b8
font_01_sfnt_off00010835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10835 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001204c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204C 10448 bytes
SHA-256: bd124bf9f6f1e045f8c4b707150ad103367766f15acb1b9563675f2cec8be664

Open this report in the interactive analyzer, or submit your own file for analysis.