Malicious PDF — malware analysis report

Static analysis result for SHA-256 4907ea72fdfe8db2…

MALICIOUS

PDF

82.6 KB Created: 2021-09-06 00:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dd0a8dd6072532e5c1b1880664cf5b83 SHA-1: 91e864269c64aa9b284b3b12c9c7bda28b5045d7 SHA-256: 4907ea72fdfe8db200f91ab79a529163cd068dec12241102a6c8ddb6c53949da
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

This PDF document was flagged by multiple heuristics, including ML classification and ClamAV, as malicious. The 'SE_MFA_LURE' heuristic indicates the document is designed to harvest credentials by mimicking multi-factor authentication prompts. The embedded URLs point to various domains, some of which are associated with compromised CMS uploads or link farms, suggesting a phishing or credential harvesting campaign. No scripts were extracted, but the overall structure and heuristics strongly suggest a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://cnc-soustruzeni.cz/files/file/95984734676.pdf In PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607479c447340---74687735684.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/49597283493.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/3527663ad40515dc3564fe2d7dd4fb8e/buradodimu.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/lisumetoli.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/28549506712.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/tevefe.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/e3f695f3290c8322b5d1fd592176bb93/wojizunaletomirojunu.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b02d1442c---xorenajivepuvemap.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/puson.pdfIn PDF document text
    • http://labsshop.com/d/files/89999347993.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/71893343159.pdfIn PDF document text
    • https://stvorki.ru/files/file/wekujaro.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/15858652047.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/wujaxufelujaloluruluguti.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/17557448303.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/60640200070.pdfIn PDF document text
    • https://netlandschool.cl/files/gepivoxutejoxuxug.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/78217735289.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dec13ced318---94940003484.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/wamuzelujojixuki.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160854bf8a3426---poloxe.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfeb35b8c7---wiwakuwepoxiguruk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=digestzen+touch+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D4 10752 bytes
SHA-256: 6137ad8eab1b2ecbb7035301f971840ae78ef27cdba331b6b076cce07e8ecfa0
font_01_sfnt_off0000ec5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10467 2028 bytes
SHA-256: 0cdb8898e5c0a52d19051808e59632856483e8411825dc59bdd373fce6f52033
font_03_sfnt_off00010db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB4 17544 bytes
SHA-256: 663e317de9cebf9605d30b8fe3bb0748e742c7252f1078d3c07b0e28f955249b

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