Malicious PDF — malware analysis report

Static analysis result for SHA-256 0eefffcacd2bb650…

MALICIOUS

PDF

88.1 KB Created: 2021-07-03 23:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d5c4dd5044d0f5f7dd7eb7dbf22dda89 SHA-1: ce0e97c3c688690979d93d63fd29d0c54e2a1c07 SHA-256: 0eefffcacd2bb6501a14f03f69a97ee37b679047804a82219d89c6ece5a54811
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of these links, combined with the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic, indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/6b9ca63b91bbcd9c39aaced255b57823/butexupomezudogimo.pdf In PDF document text
    • http://qtjdb.com/UploadFile/2021/05/15/file/20210515_165501_191.pdfIn PDF document text
    • http://short-story.ru/upload/file/87840584671.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0effd96ee---dezedatozudulivim.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/1d6e3e0e15d21d992281e666d584d4cb/15163470629.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/8dd414e01f518f8f1769175faac85caf/76063708886.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083929c2fa34---puvekugotefekigexexak.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/c2cbb2da29636dda65607a03627e95f3/2625597073.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/wilepiromusojiguze.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/d496165257a61531cdc4ab37b73a8ec3/58970139351.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210509055909.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1ac0a4e07---xatomow.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/0ea86dcb3cdb8dbf08ae2390d99ab0d3/98441656632.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/garimupoxek.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/78053947795.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f97841d50d---11832985898.pdfIn PDF document text
    • http://cezanart.com/userfiles/file/29821553209.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2cd6c4f9f---tudozozutedorotugejuvine.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/dujetowewejigovugivabid.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/97798550880.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608cda2591eed---25434993566.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608625276bf6b---zupowunibetakilirekojij.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b70c59a3718---bijoburezovavokewok.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/38891264165.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/rikuzuxoripagerep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=heart+angiography+test+pricePDF 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_off0000f575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF575 17404 bytes
SHA-256: 73d66fe51bb2b1a4159a17b27b129ee603843bed0b7321b0d8b2e6a753841e0f
font_01_sfnt_off0001226f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226F 10712 bytes
SHA-256: 33ccf8248ea7cb1bb5f55b68e67a0fb7d243b91704a5b3e9375cf0936f621bc1
font_02_sfnt_off00013afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1