Malicious PDF — malware analysis report

Static analysis result for SHA-256 901d681cedeb2137…

MALICIOUS

PDF

80.5 KB Created: 2021-09-20 11:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dfd77ad9260123f54d881157f20c4b4d SHA-1: 97becb1dc41329210b24781c051a8aef8cae3c95 SHA-256: 901d681cedeb21373dccb1241320d9bc26d7fe2214fe29d7f4cb8887f700a98a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous external URIs and links to compromised CMS uploads, suggesting a phishing or malware distribution lure. The presence of embedded URLs and the nature of the links indicate an attempt to redirect the user to malicious content hosted on external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://garglob.ru/uplcv?utm_term=face+match+celebrity+look+alike+apk PDF link annotation
    • https://fiberglasssupplydepot.com/userfiles/file/86981476827.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/gavefumosefes.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/nidesaguw.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/97950378457.pdfIn PDF document text
    • https://manenshop.com/upload/files/nujolododuwepu.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/96606995588.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/87609890032.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/49e967470cbe5d0701b1d5de8e01819d/75508261964.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/lisibosimiwidel.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/529659240.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/wenatunezexob.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109201014209069.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/mewekup.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/10352633407.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/58995467634.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/5894442512.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/fifesugiradevof.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/efdcde68cbbcb04a921f155bf7cd01c7/13119627229.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613009970db87---deforuzilepo.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/98760717600.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16135281e0254b---bafufabusobebenite.pdfIn PDF document text
    • http://infunplastic.com/d/files/74317533563.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/rarofedabifanazup.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/jaginusulafawavojumuvav.pdfIn PDF document text
    • 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_off0000d788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD788 17176 bytes
SHA-256: 5872bc53c0a5a0eec0b7d5e6b90b5cd65fbef7554792dd5dfaa81d099d2151ed
font_01_sfnt_off00010410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10410 10688 bytes
SHA-256: c8cb68a362256fd926bad0d8b4c5e2f9e508f50218627683daafef8694dcde7f
font_02_sfnt_off00011c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1