Malicious PDF — malware analysis report

Static analysis result for SHA-256 1134f5ef885bd753…

MALICIOUS

PDF

82.6 KB Created: 2021-09-10 14:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8bce4c77fb4dcc1544d0d9c23a79030d SHA-1: f4c3490a62c1c27b040ce53e2b816936dd5fda3c SHA-256: 1134f5ef885bd7533b31ed4b1bd71db570222aa928b25b7308234acc94b52357
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 are part of link farms hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple links to potentially malicious content suggests an attempt to direct users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=shareit+apk+iphone+download PDF link annotation
    • http://awkontrakt.pl/ckfinder/userfiles/files/22173983325.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/99592540367.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/zidajusu.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/nasonoxukojaduwun.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/61040100439.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/6525426928.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/xetatatasuvunax.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/63498725221.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/revuvudaguwolivetipozavup.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/lurizejarisegag.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/bazuzulaxo.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/60946329413.pdfIn PDF document text
    • https://alev.az/userfiles/file/9351870693.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/dogitelisuragijosigifer.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16136cc9e7c8c6---givozexubumozuvas.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/vavolojutesazuduje.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/lvd7l1r63g2bbuh1fdqo7vbttv/57354209465.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/tulitonotefib.pdfIn PDF document text
    • http://podarox.ru/public/files/36914720962.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161303922d0e6e---19394435559.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/nokidupirenoz.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/3200676523.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613138597834f---felukopanudexixifivemira.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/91655859750.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_off0000dce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE9 18328 bytes
SHA-256: b86222b96a8f799fb2e7e8f3bb40016007cdbb6c563515d8dddeea88d7f7b3b7
font_01_sfnt_off00010c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A8 10576 bytes
SHA-256: fa607d7cc3c17f55a1c9eb09e180965698b6ed1572d186a2b70118a028e842dd