Malicious PDF — malware analysis report

Static analysis result for SHA-256 e834f45cc900406f…

MALICIOUS

PDF

84.6 KB Created: 2021-09-05 07:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5a9de5e4ca254872a8bb89ff77a7e230 SHA-1: 630af9cd92cadc6114d96e76d5b3aca233fd7286 SHA-256: e834f45cc900406f2aaf4f400da9e2fcacf25f6d5b29ec991cdb6f857390e40c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malware or engage in phishing. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, often initiated via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://fasleh.net/Files/files/muxifi.pdf In PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/7e8gq4qe01id6ae39vfi28pane/pawafonutimov.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/44421099452.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/77f2caf072aaaa5d59dd187351f3fcda/rururunoxawepebisigikof.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/sixusetunanujulib.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/74531402416.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/50622362364.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/28549389028.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/pelaxogubiw.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/merexuzitidosurotuwude.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/mariparoku.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/38511709490.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/cf067fe784bea6f499057be5f1455ef7/49276331878.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/tekux.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8592e0adb---90092283263.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/om7vhdp5h9lpt3dusmhc5ggf2i/20782814004.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/lovumixe.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/bd8fr6eevjo5mgi8qf056gohch/ditakefa.pdfIn PDF document text
    • http://gardatrans.com/content/Files/titosatuvodasibeleweri.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f215074666a5bbbcba2fc1a25c352dc1/wemav.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/f10fdf83900b609b27efd21c1fb4613a/22652640565.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/wekudinudetuliwudek.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caaa4a0d53d---13098148798.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/piwitixanukirowasidolej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=oxford+new+headway+beginner+student%27s+book+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC657 16164 bytes
SHA-256: a0f26d9ec2bc0bbc84dfb8c1a224a49f7f70479ac92e21d726acd811d43f3bd1
font_01_sfnt_off0000dbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF8 21040 bytes
SHA-256: fc192bb35e10979b5d85ef6540b0b2a4a7d529271799bf0e57f3c94e79c338d6
font_02_sfnt_off00011130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11130 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12947 11424 bytes
SHA-256: c14f9b002484231200cfcad10ef75259f89a4f1992e5db09388d7b6c0387277b

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