Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3df506ecedbfe43…

MALICIOUS

PDF

88.6 KB Created: 2021-07-05 05:30:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee24a95f713607799a5342c02f8f6a7e SHA-1: 8a4f0b7abb04eafeacddc309f3812ad0a897631b SHA-256: b3df506ecedbfe43065f6bb1d6a3a3a3e47b8961799aab6747c2c6d595d438a0
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories. These links likely serve as redirects to phishing sites or malware downloaders. The presence of multiple distinct hosts and the use of formcraft plugin uploads suggest an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a267034ad6e---gokinajav.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b291e79fec4---65165769228.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16087ed803d57f---24370480938.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609203e9cd41d---48863992388.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfec4aff7d---puseriso.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8588d0e07e---wibusukugurotomizejigi.pdf
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/fefug.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073a66c06197---39679329281.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac34afb7606---fegewimefojajefi.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/1fb16f5ae4a4e5d7f90f831c7d16752e/jasugedopuwoxogirotogeve.pdf
    • http://msamericapageant.com/clients/873634/File/xagasuxozesajage.pdf
    • http://naturalmis.com/userfiles/file/85259140668.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4f9bbac62---76498235811.pdf
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/nuwuji.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77c7d1c815---48748951196.pdf
    • http://artospace.com/pics/file/41882532728.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/8c36b570b31fc500d269d0fdb5787320/domedesu.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607226601fcfd---werobeve.pdf
    • https://roweryelectra.pl/app/webroot/uploads/file/16208602061483.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4c9eb9dc79---78371324420.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083084b510fc---romesuxusanulolabezovu.pdf
    • http://lateonsettay-sachs.org/userfiles/file/23271110151.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/2b674381cb947274b5eeaca39dd53ff1/50846627410.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/a5d0374a80dc8fa623463e259915f1c2/moxuwonokategasifibifa.pdf
    • http://profitoolinfo.ru/ckfinder/userfiles/files/nujupojakuredijusavatoku.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3363ca94d6---depejuwulo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=2019+grammy+rap+album+of+the+year+nominees
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5eb.bin
5de6789fd822d5cebc97a95f5e8163cd9dad9ec8fd7e4e1948d98265af457271		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EB 16908 bytes
font_01_sfnt_off000121e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121E8 16792 bytes
font_02_sfnt_off000139ff.bin
1e84f2d8f158bb6da8a47a33f6b38882cf5f985c8c0ee241465c44694a92493a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139FF 11524 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.