Malicious PDF — malware analysis report

Static analysis result for SHA-256 825bea43fa709710…

MALICIOUS

PDF

74.3 KB Created: 2021-08-28 03:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 841e5756e756cc559bd3757babeb67c0 SHA-1: 9f21957df4b675ca4e10ff1a02e41a497770d2a5 SHA-256: 825bea43fa709710d53aac2aef752f34058097cf2b70f50a2ee7434f67b14304
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. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The heuristic 'SE_LOLBIN_RUN_COMMAND' indicates the presence of commands within the document text, likely intended to redirect users to malicious sites for phishing or further payload delivery. No scripts were extracted, but the overall structure and URL distribution strongly indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://coretry.ru/uplcv?utm_term=all+stars+codes PDF link annotation
    • https://transport-vehicules.fr/userfiles/file/lomuni.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8448a73c5e---53190835480.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/5g7oncq6dmhq4rlss4u0cci6up/5142499189.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/widuwugux.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021051504504582.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091443476071---23252818549.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/bewazawuguluzak.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160814bc18ebea---46116358622.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160faca852f3af---13985561025.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/9441930093.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/44874941086.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070b3a33f43a---63012295869.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/2454e013679c756452627b21e8d08556/davixe.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/69303132912.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/19166738251.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/05ca59087d86c7fc5de56d4d261ba4e6/kidotubedulepe.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1c414454d---mulijizasagufagejize.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/012337233686.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/tqbffr7s4qbqg1ln3ri2cr87ha/24431799867.pdfIn PDF document text
    • https://phr4u.com/files/1903214393.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/50c5383d13df88f0359cdebc7560d6c2/judedozosufivaliripiz.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202108/file/18790376988.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/toleladep.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/a152e2a5263becca80b59ea1edce484b/51138150343.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/dujulunenogugabunuziko.pdfIn PDF document text
    • https://goldenparadisestsIn macro / runtime command snippet
    • https://lapdonline.org/file/89543120190.pdfIn PDF document text
    • 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_off0000c187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC187 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD999 16492 bytes
SHA-256: db5745b6712321bd469250a33a182a29cf4044f06879de9ef256697a23bc8929
font_02_sfnt_off000103db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DB 10148 bytes
SHA-256: 2700c6164406974c23703a9ce23644f41dc66ae15365787b2784287fc53a8604

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