Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ba8315f8c6a9a75…

MALICIOUS

PDF

153.8 KB Created: 2021-07-24 00:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bd97b193236564d5a9c60221438dfbc1 SHA-1: a2c17e66c4aadd9de1551a20a5cb69bbcd888776 SHA-256: 9ba8315f8c6a9a758389cfdce395639e5b3ec4be3c3ec5e366170be275d8cb23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many of which point to websites hosted on compromised CMS platforms or disposable domains, 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.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://rld-carbon.ru/file/jiditimegajazemed.pdf In PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/9c232ed9f3780497d7e5d2e949ea4646/rolodufemu.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/98684397763.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/rukidofifiwolefirovevof.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/66132284726.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/fcf6bc1899d4f8548738079c683d252f/vogiripejixigojojojawib.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/fhqn2cd776i0tsvjoa9pc1upjj/25897758793.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a0fb9684e---74629091305.pdfIn PDF document text
    • https://led7.ru/file/wusiwekobevakexokeruxa.pdfIn PDF document text
    • https://cncunse.com/d/files/vekuxakutixujug.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/sidazavikenuvakuzutosip.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/s1gl1mbl2h76dbjertcile8u7n/narazewevigevam.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/a6995bd30e13bb9df937ca71bc99a78b/jegimemezujoxaririd.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/lp38lad6gem9a2toqk4clar833/dumexisojibazukuninopix.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/90678284406.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160d2328977393---fopigajitezesuxupitemik.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/gno0mi1m09s2e2l4c1900ansas/pusabakifibaxuzuzo.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e61c4500364---dukizodinurawodano.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/gexawit.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091cedb2d2ed---97611711443.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/59479038228.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/42321952113.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/bedamepufijekem.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/f58916d455576ff629e9ca170eeca9bf/zigolezexelenubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=delta+sigma+theta+membership+intake+process+2018PDF 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_off0001f3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F3A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00020bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20BB9 11556 bytes
SHA-256: 29b84264e9aea773ff68564037e086c9d3fcd9c8dce586b2f24c630b161bf131
font_02_sfnt_off000226d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x226D0 18304 bytes
SHA-256: e8304c99e534f2a4d4bd228072709428e26978aa285c37a0a8b807a135feab37