Malicious PDF — malware analysis report

Static analysis result for SHA-256 419c76d43a2216c3…

MALICIOUS

PDF

72.1 KB Created: 2021-09-05 20:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2f14da1ffdb6e564971291a14e4f6ba3 SHA-1: db5fd4153b70c59c395171c813f950abae8d8160 SHA-256: 419c76d43a2216c351e4f74a751682a4814144f04110cebd0c6f065c8bc97927
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other potentially untrusted domains. The primary attack pattern involves luring users to click these links, likely leading to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://quickvideo.nl/userfiles/file/44966562043.pdf In PDF document text
    • https://batikatravels.com/userfiles/file/xutimobumi.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/77931117928.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/mufadelunabexijed.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d230b3612c---51560642910.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/a38f937393cfb564170bb7c5e4e2c8ee/wadolubinidexomowoxujope.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/virigu.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/93f78e4baf44d47ad94ebaf36362be6a/5619224275.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/83240886669.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/dopijewemefagawuso.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/19837231101.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080ca79d0a24---32520147206.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/46329184429.pdfIn PDF document text
    • http://bucketdiaries.com/uploads/files/48753137386.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/44bff358d3c8cccc6a7eee3b69ee40bc/jeforilasovawa.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/243447857.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/5psp0s9g7d3tksclrrh7g19vok/3892985017.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/69610169041.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/wanuvunivakivusikakid.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfddb4caad---13746190108.pdfIn PDF document text
    • http://brukbet.com/user_images/file/27917216025.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/wanubovarol.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/negilaka.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0340b7ec80---kanad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=aditya+hrudayam+pdf+tamilPDF 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_off0000b66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB66F 10432 bytes
SHA-256: 75cf427aa148edb9b49b39c7f78df0656808b845bad3019d4bb3cc10ab4ebc71
font_01_sfnt_off0000ce13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE625 17928 bytes
SHA-256: eecf899b14a0bfcc19e37f810277da412dfd90a691b5fe154d56a4656e3cdaad

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