Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e2394c8cf25ec0a…

MALICIOUS

PDF

73.9 KB Created: 2021-09-05 21:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2573a3241157dbb26069f2cfa1d3273d SHA-1: a1f17315eb1acf29f9fda6cc00f8318b6ff6d980 SHA-256: 5e2394c8cf25ec0a3d1ec136047e1bc46ddf1c73e7155a5faf00266f494dce50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for link farms, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chipgene.com/image/files/20210814_194335.pdf In PDF document text
    • http://farashimirooz.com/files/54929612888.pdfIn PDF document text
    • https://venus-forever.com/image/files/85000696862.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/pesizuvotobev.pdfIn PDF document text
    • https://moscowfashion.net/content/xuploadimages/file/71178677217.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9702f39af---wekufibivigugipowekunap.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af95e138816---zademo.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/c684fa962d3bf57b039f011e585f2ed5/51096230167.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/talamalexuzusure.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608472c05f057---68413347959.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce6b602f1a---fegofakuxegikizibigovu.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/gru2k8m9ae1mqi8b801dnh67q2/bejulopisibolud.pdfIn PDF document text
    • http://armanetti.com/images/82277482119.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/firaduzununomazen.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/818c3f37dffa99384966ed1e85acb651/xufeloxa.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/hu7tv5vmsjp70prqhchsu15f7a/kasofosisitugeru.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160817a67d18be---4050295125.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/5ce048d30fd90e2d8e319811c6b6583f/womudol.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/78247655388.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/fazeviwoziritev.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/jeviredakuvanekabiliwi.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/6775999715.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160729006682af---75918358333.pdfIn PDF document text
    • http://vodnik48.ru/content/file/fugopavizikigenitaludet.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/9379913867.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=little+caesars+nutrition+information+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_off0000befb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEFB 16204 bytes
SHA-256: e8c3c4b0f208ffd2e6745059f82f9e467c12da827ae0f7f1a143e0f4a88a229a
font_01_sfnt_off0000e884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE884 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001009b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009B 10840 bytes
SHA-256: e3e06ea4a7ba58c2b86fef9899c9bf4879afaa124f89e7c329af59f3bad6569d