Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cda51320b4e0cf5…

MALICIOUS

PDF

86.6 KB Created: 2021-07-21 05:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 92c88092e6695286b9692e871523dff9 SHA-1: 28d21f95e96a2cbc47b3453cd86ab87d081f66ce SHA-256: 7cda51320b4e0cf5d174c8a602ba8de6d91e47f17e859b2eacf0dc01e874560a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a link farm hosted on compromised WordPress sites and disposable domains, strongly indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection confirm its malicious nature. While no scripts were directly extracted, the PDF structure and embedded links suggest it is designed to redirect users to malicious content, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ludifrance.fr/userfiles/file/22522098095.pdf In PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085b73deed41---vidixero.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca160d8029---27330408209.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16259082011179.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/qt9vgrjjca24t3uedfijnmrnt2/pijaniwolubozepu.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/41b85b1023ead249bc2157913da6f486/lunovuzejekamodivu.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/1f6lq5b7s9rbt17v8tnraubq4s/petamakukas.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/86035633296.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/sujuzokukiferukikenifa.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093bf556b922---54774540140.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/df1e799950b1c709d4fa5d95503bedee/20907003823.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/penulumedoge.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609edea59093b---jodapexesitatirala.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/bomotobawamadesegobabup.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210622175009.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/08223df0a959112b2f6a517a4a4750c2/wetabotemowodaxaki.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a7bf2fd32---65974825079.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/lurotiraguz.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/vakobenifuja.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c403560bb6a---tixegazitedepew.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/86332282562.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/3647904038.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfc14464b8---38497699938.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=taylor+swift+love+story+chordPDF 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_off0000eee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE9 17500 bytes
SHA-256: c09ef550a8d7e3a066bc3c6672b0deb6b29b4fb53f45f461af632100bf8b633f
font_01_sfnt_off00011c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C93 10700 bytes
SHA-256: 89e4e0169b35f1cae5d134165e6f3248f3ac25b9d3cf551e88cd2370b6379720
font_02_sfnt_off00013566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13566 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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