Malicious PDF — malware analysis report

Static analysis result for SHA-256 a45b9b06eb9220e9…

MALICIOUS

PDF

78.3 KB Created: 2021-09-08 08:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5f8c5e042960e5bfa48867cce73a4e4c SHA-1: e4158e63dbb63360527ffce66fb65376a35a6c12 SHA-256: a45b9b06eb9220e9c9353fbe5c608bfd552b48fb3f977e4e5952923fb37b46a2
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, including compromised WordPress sites and disposable hosting. This pattern is indicative of phishing or malware distribution, aiming to lure users to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wsmr.us/userfiles/file/wutapuvapixupub.pdf In PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/upkh56a4h84t8hpol36l0q5mf3/terenoduforepevib.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/30255386499.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/selagijomonu.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ac4427fa0---67093372250.pdfIn PDF document text
    • http://stringpoets.com/userfiles/file/moluga.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160765f811f41d---23411218393.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/79632576142.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/0da0b398ac1227635462a9b290167ac9/toxigu.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/6e503fdbc440d23d14a14a23be4232d7/1466874622.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/3495329df8bd1f18d84c21a3219cd8b1/nugudezis.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0c9a9284b---3288255041.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/42d7a031f43c5e04f19ba60651ff208f/muzemubadakiwezig.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/naziguwoxaveripetenoji.pdfIn PDF document text
    • http://salinasouth.com/clients/11073/File/wasaguworezufusolifib.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/67975022802.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9376dc917---juneruvi.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9fccbc10c---91439346841.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/nadix.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/57ff151089f95fdcc644e8bc6fad330d/76061752053.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/84958586372.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=vibrational+energy+levels+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_off0000cb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE385 10960 bytes
SHA-256: 63c26150e568158411d7d0e454843b62198735bebfb4f65e363918d195f52587
font_02_sfnt_off0000fcb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB5 18264 bytes
SHA-256: 516b46296783c5ffe766c492a1b7d2c47b7e55e5f59742bac58b2e5e79bfb156

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