Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb8fde40614f5b62…

MALICIOUS

PDF

91.9 KB Created: 2021-09-08 17:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f0ceb0b5d817f1f50ecaf45c7354bf96 SHA-1: 0dceb01a7720b3a295255773ffe1dd2c9d1e3263 SHA-256: eb8fde40614f5b625298bcf669acc7db9305811c35fc2a289c55e485ba062396
156 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://interior-mark.com/ckfinder/userfiles/files/rilur.pdf In PDF document text
    • https://pypconsultores.mx/userfiles/file/ritodaziputonutewexesi.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/70642339350.pdfIn PDF document text
    • http://esteel.my/userfiles/file/41663898660.pdfIn PDF document text
    • http://air-con.ru/upload/files/kenisowajovut.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/97582468383.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/tibaruxewurevukaso.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/33666719335.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/42353250288.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f8e07ff53---sufugodunu.pdfIn PDF document text
    • https://trystsalonri.com/images/file/62290785610.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109030357458963.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/lasimosagibu.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/64141796134.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/26574759135.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/46018557552.pdfIn PDF document text
    • http://tnetimes.kr/upload/file///627057364.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135a46c20913---25494177571.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/60344974962.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/1078159028.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/situsazubawawewu.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/ziwogefexufuw.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/bifekejesesunekawitadeg.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/65530445418.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/37065148930.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612efee80680f---47311874286.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=sonos+play+one+gen+2+manualPDF 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_off00010208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10208 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1F 10712 bytes
SHA-256: 64594f2ae37f005544996eebca095409d1db2cd3c8c209a6537b1df52a383725
font_02_sfnt_off000132d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D1 17924 bytes
SHA-256: 4e84c9e053ebd9ff617064df14db67d029a0bb2a1b6aaf0f60889e60152a2f1c