Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3763e2d2306ad6e…

MALICIOUS

PDF

73.0 KB Created: 2021-09-03 20:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5398e9f17da362dace04ca1403a2507a SHA-1: faeeb4fa17403f3c9bc414062e5b0ce81865468b SHA-256: b3763e2d2306ad6ef9af15fa13e33e5f196b3b7aa21bfa19f644fb65af7ab45f
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to potentially compromised or disposable hosting domains. Heuristics indicate this is a link farm, and the ClamAV detection suggests it is a phishing or trojan distribution attempt. The ML classifier also strongly flagged this PDF as malicious.

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://shiokerbau1.com/contents/files/zapabexarojekat.pdf In PDF document text
    • http://bartuceviri.com/userfiles/file/58746019875.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/47380383768.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16077cd450b504---xijojazipesabagojala.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/37610464fd5f44ea720b083622210009/6096848228.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/31c71488eb165b9e0ecea77aea439560/xisekugijakovilipizelunu.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/vakixabeve.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/xorafakunuwinurujur.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109f23803dc3---kemutovuturerokan.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a420a1d63b4---86002741470.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8fe47d769---67850931122.pdfIn PDF document text
    • http://smartarts.bg/userfiles/file/dikokov.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/jepomozijak.pdfIn PDF document text
    • https://digireg.si/upload/50413161375.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/lisoxujubagused.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/1cdf9raeguhaji8v8g0384c0o7/15194465459.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/xariburibimalenako.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4a89ba94b6---sitaloxajoj.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/44925596552.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/67436357760.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f7fd588e94---fawizebu.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/1024ef47843b018077d5a4928fd155f2/9327718170.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609842275e975---45017375263.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=graph+theory+combinatorics+and+algorithms+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_off0000b80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB80F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD021 16788 bytes
SHA-256: 407d770d9849b5db84d135fbb0d2948c65f12bac8ea4e8b7cb062feebfb428f0
font_02_sfnt_off0000fbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC0 11360 bytes
SHA-256: 28c2d1de5ff575341fc947f80d54858d5c240569d898309911c6ffc02a572405

Open this report in the interactive analyzer, or submit your own file for analysis.