Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7753368ff4d31b2…

MALICIOUS

PDF

79.4 KB Created: 2021-08-28 13:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ac2084cdd954451967018f865f88e6ed SHA-1: 37bd71f3a869a1432f5b8ac41d1a1beaf567490d SHA-256: b7753368ff4d31b2bfb4c9ef478d0050d9b3920c32b6679cc5c7010e69c91c41
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aiming to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de884e20d0---43055709260.pdf In PDF document text
    • https://manhremhoangvan.vn/wp-content/uploads/files/sisoxetakuresoxezukimaxi.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///pigararojumapemowemulip.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609076f50c887---jiwuwatitapi.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/luwoxalipi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db997e38cd4---fejukopuludenudetureluten.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b37f8413ec9---ruwik.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/b12da71a6e0bc6495813f4372e2849dd/71054423956.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/89873497bddf735ae9b66d5ff1c3b36a/47880496046.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/mugesoxatamox.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/kimuxapuwomajan.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5988bd13c0---sabufobajodikik.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/subofov.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/xadufenud.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/wetep.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/nakuwebixudonukobobogope.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/39639250549.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160f50a708c70f---14596388467.pdfIn PDF document text
    • http://asustainable.com/global/file/1558488928.pdfIn PDF document text
    • https://fratellifurloni.it/file/76885562554.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/rumijadesogibezixamij.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16071d31f249e6---25726251782.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/lerajukoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=dark+souls+2+ps4+modded+savePDF 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_off0000d18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A1 17668 bytes
SHA-256: 1ac8c497f3a4ca1810465a1b5dbf9a3ec166c7d23dd64bdb5da13f84154432f4
font_02_sfnt_off000117e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E7 10716 bytes
SHA-256: 05327cf5de66c20810aebfa84a0d018740ea99ffc925f49e6a2bacdd12c0458f