Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb0646a6a6fdb241…

MALICIOUS

PDF

72.6 KB Created: 2021-09-16 22:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0fcb6bc62da0cb1f09d803d527765d97 SHA-1: d7a5ca993d0683fb707b4bf2685831af6bc5eba8 SHA-256: fb0646a6a6fdb2417a8baccc9170835aaf87a4009033a89b4e2b218db7eb8e2e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates potential for further malicious actions, such as exploiting browser vulnerabilities or downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://wastran.ru/uplcv?utm_term=cut+cut+cutout+photo+background+editor PDF link annotation
    • http://bigbazar.cz/is/images/FCKeditor/File/zudidazilugikowegubitawab.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/89822936173.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/bureri.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/perejerekonikubezosezur.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/visis.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/74949577742.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136aa88c7184---49417671579.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/65073883973.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139da0e2d385---81345621135.pdfIn PDF document text
    • https://losungversorger.com/product/file/60882192597.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/dufanupafevoxisurikotu.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/jariwokotogat.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/85549870738.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/80548223303.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/1fce82c589bd0d70cf22b89a51858cbf/58134549746.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/lunefuxifofipenejozisit.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/tuduzawutukanukawokoxeku.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/difikovadepewipaxijelunu.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/18712971698.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/kijaxatuxilulefezawanipax.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/ledaruxegomolifijuxubeba.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/56129292703.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/76061251721.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/27788696301.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/dajopurodosebonoken.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_off0000b54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB54A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5C 18648 bytes
SHA-256: c4e8ec70566c8b9104a13b94beaffa186c177834ceb22bdf998bae325254e3b3
font_02_sfnt_off0000fbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB0 10944 bytes
SHA-256: 0ef4918c404edd5200c466f11c460eef2061295b2978d1d09d5f8b215dc6c9bf

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