Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d0047bdd26ca1db…

MALICIOUS

PDF

73.3 KB Created: 2021-09-03 22:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e1dd7895e4bad3d95ab83b7e0b2260ea SHA-1: adda0b571706bafcb0e75a7cf718ca3524675195 SHA-256: 6d0047bdd26ca1dbffcf480965a7086bbb8bdad3f3553f50a348dd4863b06447
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or initiating malicious actions. The presence of multiple external URIs, many pointing to compromised CMS uploads and disposable hosting, indicates a link farm designed to redirect users. This suggests the PDF's primary purpose is to lure victims to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5d1604484---ratanexapaj.pdf In PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/f9tfg2t7un4e222labie9lo9p0/24727348484.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/34556289195.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2acef116e---lijababarugopujage.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/gulunilomuw.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/3637724669.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/qdi33g8grm0lpebg9r0vnp7n84/39013268512.pdfIn PDF document text
    • https://kuepancong.com/contents//files/wafasupejedamilazel.pdfIn PDF document text
    • http://ktcz.eu/files/files/nebitidokanewulosol.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/12k3f44t74ma45vaeem73demd7/56715322915.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/vojisilidoxilasovodoni.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/59702489754.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/vizolusud.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/61491ff81598c69af13908fe02678915/80019730894.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/62596886345.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/watesasajumoxe.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba995d5fb5---norosexegerigimil.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/mewixazatubizodez.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/zezixi.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/4d2257b2fa421560aaf49fb13e1ca243/bafalusi.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/dabosiz.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/kowon.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/82426404788.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/q4unlt976il9muvbhuqk8qovo8/zolujowowagexomozomeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=malayala+manorama+newspaper+pdf+filePDF 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_off0000ba40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA40 16936 bytes
SHA-256: 9688cf154293cd876276dd39502a348f5ddbfacfd8447769984174d6e0a8ab1e
font_01_sfnt_off0000e656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE656 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6D 10752 bytes
SHA-256: c621249866e8633c898e9a4d93d7b953c85320113ba9dde4566e8f07ed18009d

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