Malicious PDF — malware analysis report

Static analysis result for SHA-256 7529f680496959a2…

MALICIOUS

PDF

94.1 KB Created: 2021-09-13 02:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 891fab3432de9dc22ce97066fac53379 SHA-1: c6de8b9e98938092c3d0bddec4ba1908bcf083b2 SHA-256: 7529f680496959a285e6f66742a770c2d6c37751f89118e00f074a8695e1fce7
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

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 http://thebodyclubonline.com/userfiles/file/naferofatipimurokedudojig.pdf In PDF document text
    • https://jagamimpi.com/contents/files/vofafelut.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/jagenebisebokorimusewo.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/41393578990.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613320fa46fcd---11618992307.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/siwuxe.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/dubibezeru.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16131a273d5f3d---53050932155.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/22276380651.pdfIn PDF document text
    • http://state-lithium.com/upload/files/bomidogoramimego.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba05d41a0e---gezedogata.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/vobuberifiwotaluvulatove.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/gagofekumumeguveberuv.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/lowun.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109030946196740.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/2942403611.pdfIn PDF document text
    • http://3q1p.com/upload/file/210908185244056376zu9tcsbpopos.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161302d9aec1ef---dirivuwuravifijopusetibo.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/50134325591.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/64390776457.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/juvapotemebirawidexubip.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/demumanovofupomifo.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/wunorur.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/jojiduvufunifaxem.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/91982816207.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/vifamolodaguzo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=implosion+never+lose+hope+full+versionPDF 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_off00010be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE0 18148 bytes
SHA-256: ed3beb3e57a2d3b2abdfd88311dbef694dedf946fffccf56bb99d77896ea6241
font_01_sfnt_off00013b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B2A 10480 bytes
SHA-256: f80245192ab13977e31815afa305207d3bc0121ef7b22b989bbaf4a72e98f8df
font_02_sfnt_off000152b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1