Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf50181a64be5f05…

MALICIOUS

PDF

94.5 KB Created: 2021-08-20 18:36:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: c95c35db2ae6adae4fb24e343c1ec6a3 SHA-1: 1411633f16ced7a5a967d9d5a6c402193695e397 SHA-256: bf50181a64be5f0573dbfb570b455d6f4c743888d8db4a4b60713bf204ab3852
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://saipanbooking.com/FileData/ckfinder/files/20210713_48FEEF5A3C4772D4.pdf In PDF document text
    • https://tresonance.org/uploadfiles/jexakenunalosixoxevorebir.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2dbdd3eea---golibejugitobajupu.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/sia03p20ceoqhp57dktfkn37cc/28506944359.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b28e7d86cbf---xikilig.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/livejupironepajekim.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/gaxiravukuwevane.pdfIn PDF document text
    • http://philboyd.com/7648693967.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sijaxoti.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/59cpfk3tl6pprkvfq500lbkof6/79944511285.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/venekabezufufipeg.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b370a8741d0---zulubizakikosoviwipix.pdfIn PDF document text
    • http://riph.pl/userfiles/file/famifezul.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/h1rip24martl0552rnp4e3egv1/38194313469.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/45482110853.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/16382590118.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/28ecfe442cfe1ec7beb270658b6a8ec9/88881830734.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/muneba.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/2e148aac7d6052a4d123fe6ab99efe43/felaperuvub.pdfIn PDF document text
    • https://andrejc.si/files/file/55237889176.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/9ec524b36bdbed00cc7eaa04980df92c/30605345188.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/f5otnl3fup5a3e6f21po4mon9s/dadutatarasogovowomolawi.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/filaridotifagubediputam.pdfIn PDF document text
    • http://sns.hu/_user/file/ruwuvuwutodivawugekan.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/mqrst5sabvq2jceob5br4t8mce/21841074527.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=doraemon+the+movie+2017+great+adventure+in+the+antarctic+kachi+kochi+in+hindi+dubbedPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C9 2652 bytes
SHA-256: bd28ab35899996d65de895cf4e501e63b58fcc2652665e05f654b43657a726d5
font_02_sfnt_off00010ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF5 16592 bytes
SHA-256: 3b5bf52827107f50626c091cc69b8f9e31be1363c88eb09f55853c6d7606f18c
font_03_sfnt_off00012737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12737 11344 bytes
SHA-256: 651898316e8d49146e7965cd53ff58932aa2d9e816473565415ae7f7341b8595
font_04_sfnt_off000141a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141A1 15764 bytes
SHA-256: d0f3c9f8eb5af0057cb08fc1e195bf8c521a397e2d9f152755ea9a94b41d81ba