Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbf5ab4613f65c2c…

MALICIOUS

PDF

81.3 KB Created: 2021-08-29 08:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8e3aee1b6eede52a736613c493e59ed6 SHA-1: 94e76b13905105ccaaf0a53d94ec4591cb3bbc04 SHA-256: fbf5ab4613f65c2c58b40a7c327bd5863ffb920358aba4df595b84916f1bf10c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV and an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a85924d4c24---lejewasidutew.pdf In PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/c25c25cfbfe0435a2ef09bd7dff0fc4f/97154460868.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16086b3751ece9---xodibaberabidusodokupumiw.pdfIn PDF document text
    • http://redhillplantation.com/clients/1/1a/1a02e1fabf1298af97853074613e4b20/File/29678604767.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/zolelafosixilefati.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef335b09bb---2483054940.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/pekonezikaludafifozodovo.pdfIn PDF document text
    • http://ihvanturizm.com/rsm/files/nawepopufawixige.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/reson.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/1081458786.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25484d895b---xozomejifosomupawik.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070e8948c104---fepugelagedinibuxixege.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16123b7862ccff---49968651794.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210825200757.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e8878a409---zemadag.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/mabinabavugajasufalaba.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/40377119732.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/20845571416.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/99953471102.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/377597d42a341dcde93d1bc9e76a5af7/wemenawapukirekumeg.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/79605509322.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/59107109912.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/83102147274.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078221bc4e4e---zadesexifib.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/bokugosulizolamomu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=ministry+of+commerce+and+industry+internshipPDF 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_off0000d8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C1 17136 bytes
SHA-256: 6e8e57de161000e6600a3e0f88c32c75b4ff19e117291814b0fb387e6c1ff381
font_01_sfnt_off000104b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCD 11044 bytes
SHA-256: 9ea1fa052f08eb3c99a6826f928f51dac6c87469a4b346250c367ee9841b3b42