Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf78aee6ea84d72a…

MALICIOUS

PDF

84.7 KB Created: 2021-09-05 13:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b0994b93e51d50355ec4d4a4e07f675e SHA-1: d0daa44dc7eeff1199c3a5c8c36995adb42c8c75 SHA-256: bf78aee6ea84d72a0d51fe47cf4953a7d507e8c89e1fa2b4e08bdb26db3c66ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous external URLs are embedded, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pistant.ru/uplcv?utm_term=knock+em+dead+martin+yate+pdf PDF link annotation
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115eee8d9e11---sugifexuxanuxiginexubenok.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/43711380751.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/zunovidukari.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/zododugarunaji.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/33145739669.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/91081348897.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/wodarelepuzoto.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160dbefc8268a0---84996316575.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/ronizusik.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721cac1765d---16963649934.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/1cee2f73577f3fd59a4cd85b7a7b4bce/degipejigugejubuwebaveju.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/c119b728daaf48a0b3cc3d66814db363/mikagu.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/towixa.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/lapuweraxovivimakiwun.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/dc19d175cc6566d7f12441c7da928d6e/xonap.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6877447248---61992773760.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/480b512957d6da24ef460999fb4f74dc/nonasewidilewemebopijuj.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/negewi.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/040a80accc533235f2ab890482080ad6/87741288205.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/megelal.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/a81d5b5bc5e4d3f1395d7a1f59190598/1540687754.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/c756b6dcd74df1a8bff10638eed2c6d2/putewo.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/69539271185.pdfIn PDF document text
    • 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_off0000e2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABE 10764 bytes
SHA-256: 83ee5caff38c4a43f9a8ed4c01896775c5079060ddf9607a6c8e3b55be4dcf27
font_02_sfnt_off00011384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11384 19020 bytes
SHA-256: 3f2ff384550c23000a51515b2299bdd275ad01fef4a6edbdf913bfd37d408ec3

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