Malicious PDF — malware analysis report

Static analysis result for SHA-256 57b00b28590684d0…

MALICIOUS

PDF

91.2 KB Created: 2021-07-02 00:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 108f70d626eb903d31b7ae99e3f8f1a8 SHA-1: 52747f9a5551fb79dc16a3b89a44c88efad135d6 SHA-256: 57b00b28590684d0084df36268058ce1899b1deb8c207931b6a01ef3b9d4d70f
96 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent. The primary attack pattern involves directing users to potentially harmful external websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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://szabobuszrendeles.hu/files/files/xofetes.pdf
    • http://sugarfree-gelato.com/upload/file/93547005496.pdf
    • http://www.mediagrand.hu//data/editorfile/pewuzatojabozosudolizez.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/ol5ls9u6j8aksqc25oho7hrv98/15415423686.pdf
    • http://thaimassagemodel.com/ckfinder/userfiles/files/46286230867.pdf
    • https://carlojans.com/cms/file/dufakukoribeti.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160afdb5d0b907---52485124835.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9e12d31ca---21443811258.pdf
    • https://djennebeads.com/nbloom/fckuploads/file/43221879888.pdf
    • http://brooklynsmokeshops.com/admin/images/file/gixukujalodipaxijirage.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c379264c5a8---pejipudanofizutoxilesuni.pdf
    • http://hokeypokeychallenge.com/clients/7/77/77ac66e313b6cb4bf602f1678accca72/File/217429037.pdf
    • http://dianacb.cz/userfiles/file/85555667612.pdf
    • http://hieuchuan.com/upload/files/juraxelov.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/84ff2da70a36aa6a26c56dc161629233/84078613798.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078392f42c76---23264252599.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f51cb9e534---gafunegabivalanetobuke.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/99b094a40628e9891d01a0b2bee683f8/gobepisote.pdf
    • http://temple.mo/userfiles/file/zogimosegiturosanu.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/b5l2pcmmgsd4s4af4ss6in7jq0/65495209007.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd8ffcc8105---95917362524.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c35cccc82a8---83164818062.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=types+of+attacks+in+network+security+ppt
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd2c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2C 16792 bytes
font_01_sfnt_off00011543.bin
f5d4e01738a58b96ec1ad0832d894ac27e64f754076738da0a32d94a00823937
pdf-font-stream PDF embedded font (sfnt) at offset 0x11543 10784 bytes
font_02_sfnt_off00012e63.bin
9bcce7cbce24b4113ca2e4d3a180e979885c41bbde9f7d9f37b1f875d995822b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E63 18516 bytes