Malicious PDF — malware analysis report

Static analysis result for SHA-256 198c62226704b2ba…

MALICIOUS

PDF

79.9 KB Created: 2021-09-17 16:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 39e9db1ac0eda4e4d98f499fb0bcbaff SHA-1: f657c9eaaeb2cd60e6223272fcf72e459e3eab3c SHA-256: 198c62226704b2ba6c6c32c5b238342a21661b5387f658c0a0925d2aa09d28c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://oniceh.ru/uplcv?utm_term=link+age+of+calamity PDF link annotation
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48808597337.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/60374103131.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/jururivobuwapivuzonawetu.pdfIn PDF document text
    • http://rfychina.com/upfiles/files/16315174589430.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/99273237108.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/xerusupu.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/93835040757.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161437fab0eac2---58920005700.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/kajurizafoxuwinafutiv.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/durefek.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/rewevuxov.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f33e281094---26697258717.pdfIn PDF document text
    • http://swhos.com/upload/files/dajirisomimutepexudufenu.pdfIn PDF document text
    • http://sin-hua.org/userfiles/koxizaredezuzodezepefefoj.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210905145344.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/livisiredasevarejurop.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/49860955717.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/koxuzolab.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131b9c8d7306---berafegunenelujipijox.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/62191390893.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/55810246506.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/71975145134.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/76607327207.pdfIn PDF document text
    • 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_off0000d567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD567 10576 bytes
SHA-256: 55ce5ccfc816a611fca72e1074371c2ee15cc53fc34794807912842accfb5891
font_01_sfnt_off0000ed86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED86 17460 bytes
SHA-256: 4d408f5ddbd3da05303c501f5bfb1a488c6e13648510cd91f2a6cb94d30788f7
font_02_sfnt_off00011a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1