Malicious PDF — malware analysis report

Static analysis result for SHA-256 4db9ce16f2bcb727…

MALICIOUS

PDF

83.6 KB Created: 2021-09-18 01:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5d3f1ca65a21cea4863123146be74c8d SHA-1: 93caf0e801cb7d3dab819b1a1ca3995e1ddc7c3e SHA-256: 4db9ce16f2bcb7270426dafee67d00a79bec8f1b661cfd78d79d2d4b2539db76
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 compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of compromised CMS upload links further supports this assessment.

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 http://www.kingsmen-cmti.com/upload/files/kekedarusefif.pdf In PDF document text
    • http://malabarisproducoes.com/arquivos/files/wokavuledukugixowodaregir.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/067f999138c6d26863a1bd6afd5b344b/13079599992.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/vapolojamojawepap.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/38137540632.pdfIn PDF document text
    • http://iviltra.lt/images/files/2822339403.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/12175509989.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/83489568198.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1bdf6f744---91127026341.pdfIn PDF document text
    • http://chenruichem.com/upload/files/91567242074.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/98597991053.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/93493692212.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/19684600539.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/wedakexip.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613930313f7e0---94733243488.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/71540622426.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/078f9a5c94bd586d502e2ba242492142/dizozarezonosa.pdfIn PDF document text
    • http://z500.si/files/xilekene.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/besedaderi.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/bebutor.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fbfa2bb56---guziromufezunoxujapo.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/70193710815.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/55521373632.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=the+richest+man+in+babylon+book+pdfPDF 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_off0000df0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF726 11192 bytes
SHA-256: 356e8ec3ca2aa4c4b1c2a69a1764bc0dd36d06e91502eb5833181014995fe5b5
font_02_sfnt_off000110fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FB 18264 bytes
SHA-256: 2ddfda850ed412399832f08b1e66532a402559ee4011db45a0fcc8589df62d9a