Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5efba141be2d5a5…

MALICIOUS

PDF

88.5 KB Created: 2021-09-03 00:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 408b215f721401dbea01d2018ae70874 SHA-1: f4cdf1146251ae826e55a6424423dcdcf59e1844 SHA-256: b5efba141be2d5a59332476fe9d322d598c6bda4e67e93d0e5d3929fcdab9b7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to websites that appear to be compromised CMS uploads, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://mraos.com/web/userfiles/file/sovipobaxabuwab.pdf In PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160aa973864c8c---83210463299.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/wijolanugapas.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bffef7e5089---kakijebepajosebumatoxiro.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/tined.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/655585964.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610bf14a0f685---6629823808.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/tavotimetinowiluraduxikum.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/suponuloxu.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/jofepudenojoxufol.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/74055080846.pdfIn PDF document text
    • http://redactron.com/userfiles/file/62792066411.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/fqndsoq907829oi5vrrnu29fr0/15620240954.pdfIn PDF document text
    • http://fotossc.pl/_files/file/52153744757.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a778a23810a---55469057536.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/suwixaxodibojuru.pdfIn PDF document text
    • http://fairmonteast1975.com/clients/0/01/014dde3c838f86fef2ac1d31a86c415b/File/zasufulit.pdfIn PDF document text
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/napigoniluti.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/6b6f83aedfd3732069e3805746e3b62d/gelogiwurazogirababu.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/72529550995.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/25633461757.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3813940153---fagaborubiga.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/24923305993.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=hyperinflation+definition+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_off0000f1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BD 10428 bytes
SHA-256: 661a6c87ce04d519ab049503a71852a488fca285bb0bf28c93a5672b2e28432c
font_01_sfnt_off00010969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10969 19468 bytes
SHA-256: 2d96c32439dac19e5b2e4b2775567f7db39559f2a9cb0b57971263e11c6a1192
font_02_sfnt_off00013c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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