Malicious PDF — malware analysis report

Static analysis result for SHA-256 e82cd9184ef0f037…

MALICIOUS

PDF

74.9 KB Created: 2021-09-07 22:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 949f135812f1602c68de77677148a899 SHA-1: c5c3180f8b5c9d512492a6df9cbfb5abe520de75 SHA-256: e82cd9184ef0f037d2917f02e50eb187235ea94a9f84928d1b63c059aed4f237
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to potentially compromised websites and disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring the user to click on these links, which are hosted on various domains, some of which appear to be compromised CMS uploads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082c5a785df4---41132676335.pdf In PDF document text
    • http://dges.in/userfiles/file/bizukamedojoj.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/7562843724.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/95368908746.pdfIn PDF document text
    • http://graham1978.com/clients/79565/File/xowulevebu.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/32bb05b09ac344741e79c97c18f9ec26/48048684758.pdfIn PDF document text
    • https://maisonforville.be/documents/file/76917542896.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/xojuger.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/jegurolugotukixuxugoba.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160781a4625ffb---86458297962.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/11679332357.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/5943083394.pdfIn PDF document text
    • https://eurotig.ro/file/37384648596.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1628335333.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/ddg0alri69gb8khhp5g4s653es/zimuxosatawirabomebonow.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/97186756094.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/6beb0bd159ec278681d258dcf7e45af2/bapidojixudemuludopamof.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-4-30/20210430201508490431.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/wefowuligimodivoxukanavek.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/202154647267076.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/66545703613.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/burujimudikirunegikivexab.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/33794648789.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/77889833412.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/89441587727.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0298201001620169175.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=the+gnostic+scriptures+ancient+wisdom+for+the+new+age+pdfPDF 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_off0000c1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A4 11172 bytes
SHA-256: f18108b0b102795c8af489e9739f071e9413bce7612cb997c740781fea7dbf66
font_01_sfnt_off0000db72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB72 16316 bytes
SHA-256: d8d9ebb3111bcb9b7c2d059890d2f384806cec91680f7bb8bc15c2294d8f08ce
font_02_sfnt_off0001055e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1