Malicious PDF — malware analysis report

Static analysis result for SHA-256 39ec3891129380c7…

MALICIOUS

PDF

85.8 KB Created: 2021-09-18 15:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 83c5e82878518516730deff77d225e84 SHA-1: f708a83309f32de6a3b68c4514b6e49fe76c37d2 SHA-256: 39ec3891129380c7e50bb726366791a443a9be5bcd23c92b3e91648debfbb1aa
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs hosted on compromised or disposable domains, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/zurufanubupi.pdf In PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/65812147357.pdfIn PDF document text
    • http://halaljones.com/uploads/files/vafupefulimewalu.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/f4dfb0f223ff67610b35087112b11063/vagusomexedunozusat.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/rugitevifogojanataga.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/varek.pdfIn PDF document text
    • https://alpinashop.bg/files/18496436189.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/wenagawefubedi.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/rewabogevu.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/67580694353.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/vuluzexipotadinamu.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/jusotojepapolup.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/munipupovi.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/71481728663.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/97660154486.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d068c06757---75815257334.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/28161972311.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343b0d8ba42---73951950995.pdfIn PDF document text
    • https://trystsalonri.com/images/file/88247693659.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/punitexa.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/pevotudexiloka.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/nupawavatijoxiwol.pdfIn PDF document text
    • http://topmebli.com/content/xuploadimages/file/45316681030.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=donotpay+app+for+androidPDF 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_off0000edbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBF 10260 bytes
SHA-256: 8c6425371c15dee99cebc15e188c463890dd01ca57d8f4950337a77a480e3fbc
font_01_sfnt_off000104ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D00 17180 bytes
SHA-256: 2bba89053122c3983ae9589901db3e4f813682d22f9fed2a9f4c5959ea13ca8a