Malicious PDF — malware analysis report

Static analysis result for SHA-256 b50a1a2aebe50792…

MALICIOUS

PDF

81.0 KB Created: 2021-06-28 19:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34f954f4f33d072702e2c4e2b9b62419 SHA-1: 4d31ed6e7f277476937dca9a487d7817f710b927 SHA-256: b50a1a2aebe50792723cbd6f5dcec7a0801f1fe6b2558de7fa8081134d769460
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to distribute further malicious content. The presence of external URIs and the PDF_RANDOM_URL_LINK heuristic strongly suggest the document's purpose is to redirect users to these compromised hosts to download additional malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16093330e79bb8---lupij.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/0btmjhi29ekhqbo7hn2rt3rt0h/51414551741.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd415e9274---fojexazilef.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160721e99c1fb6---53089661512.pdf
    • https://gelblighting.com/userfiles/files/42740787512.pdf
    • http://kfnmdg.com/upfolder/e/files/20210616022743.pdf
    • http://selfmadefilms.nl/userfiles/files/25795743286.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/d26a1bspbn1te5m1iiv4046kdp/49838734313.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/8bd912ee95fef82f14ff040f2d0cc232/xibuwifa.pdf
    • http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/fanemulemido.pdf
    • http://worldprint.su/userfiles/file/pifofimebeminozoweli.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160818996d7d3d---21739440718.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/88730124869.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2199b86ed---63951501182.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/c84v9pt99j14ko1cub90gal4le/begowiw.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ba306439a---xipodolizu.pdf
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/nixanopadufinuxozurur.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/24cb180feb219115ad500f7b1cf3f717/jirenawojakebujev.pdf
    • https://bancodevida.com/bancodevida/admin/images/image/file/20768494351.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/970fbed5c705e768e1796aef9b9dad8d/37352587911.pdf
    • http://arcomproltd.com/userfiles/file/13285117650.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077149e57619---838068934.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/13ed1b9d1a6eec60e9016f652fd111e5/68695303212.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160ac20a8ed0b0---47982932439.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608667959028d---91555066598.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/e17i2k7b00o3cmknulbofdqiss/pubirezutewekubuwo.pdf
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/1247207605.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=new+bollywood+mp3+song+2019
    • 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_off0000d868.bin
39935cafb59ce1d1100418d73299576aea7ae794dbbb9e7470f51fcb2be76631
pdf-font-stream PDF embedded font (sfnt) at offset 0xD868 16988 bytes
font_01_sfnt_off000104a7.bin
ad25dc51a2a3e88690f5922879810611f498911d51c824d6f0f4bfa1134e4526
pdf-font-stream PDF embedded font (sfnt) at offset 0x104A7 11236 bytes
font_02_sfnt_off00011eb2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB2 16792 bytes