Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b53db1a5ef68b59…

MALICIOUS

PDF

89.3 KB Created: 2021-07-13 09:41:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 24c4d0913f830dbb5850d6a122d4a1a7 SHA-1: 136f74a66ac72609b79c402d0bc9e6b698a757b0 SHA-256: 6b53db1a5ef68b59711f2b2bfb162567f02e00d86f0ee12334dafab538e6e66c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites using the Formcraft plugin. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The primary attack pattern involves luring users to these external sites, potentially for credential harvesting or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16082a7a3782de---girojilunumiwifok.pdf In PDF document text
    • http://orderkai.com/uploads/files/liwaretuzabo.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/11016984338.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d5676e2db---59957470975.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021052519321882.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079327537e4c---20464513640.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/74104229953.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/9asvdba3e62kbh02aidtkp2pb2/33233977015.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/malegodo.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16098db5dd45e5---19357321515.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16072f17b212b2---80302940912.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/nedigadibavikogi.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/029ee21bb080caf9c1199c7b01d465b4/bejabin.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d9d85cac4b0---66005895872.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1609887779dc9f---diluvub.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/jivapadopexikoxanuka.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/d5011df5c1ffb530f59c4c5acf4c14ab/ririmad.pdfIn PDF document text
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/54918187440.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081397fdf2c8---vosujuwulanofelitid.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/09k2jh21eg5utm4gpd0m6vqf96/depuxomubut.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/87524795638.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/60001841660.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=say+something+acoustic+chordsPDF 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_off0000f773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF773 17788 bytes
SHA-256: 39e5c54bf94d130d3fd4952cfc09246fd1f3885408ac3fc9b7e025521a26ab04
font_01_sfnt_off00012692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12692 11060 bytes
SHA-256: 6c76a82a53ccde83bd37bd3364410bd1cb4c744384d74fde40882d1199b1f20f
font_02_sfnt_off00013ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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