Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b0d5d3bbf165306…

MALICIOUS

PDF

81.0 KB Created: 2021-08-08 19:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 81c936d8eeb1c8b9c2a6e7e41e6d0c43 SHA-1: b7c9059e5fa2cfcbc5c32051c72c7ee6b5fa0d5e SHA-256: 5b0d5d3bbf1653060a3e3d67a71eb4ef873544dae9604c7cd205f2f2cad079a6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The 'SE_INVOICE_LURE' heuristic indicates the document's content is likely a fake invoice or payment request to entice clicks. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072ac8280b8b---5416027243.pdf In PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083446ca222e---xipiliwimosajuzivejagaful.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/zakotoxaxunokuxelifure.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/mulevigagupurugirutulix.pdfIn PDF document text
    • http://calisnt.com/uploads/files/donovid.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/d0e6ca3444b35a2844d30027df133a38/jogij.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc86656ca0---pubegen.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607056ff7b12c---42871380425.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607e495e44827---37077537815.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/60507993616.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/51756749094.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/28088740569.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/c1ba5a0a74d58c8d032053d216fddeaa/dovojadeje.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160718147bb2ed---xesegesagerelo.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/23559958897.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/pisonabakedejawo.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/95410395890.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/zatilewuzotopefurate.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/zibesavabosejitulugo.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/ca683a4559633eeefebf2f43c1e8b84b/jaxogivevomerol.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0bf18c989---togosopijiti.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071c3a33b271---63653167716.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/sorarunedufabija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=walmart+cash+register+training+videoPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/dimojojoziluzugupewipaj.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_off0000db8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8C 15724 bytes
SHA-256: ceb6ae8148d6ebbf3de9fae2685ba746e5d7810cfb680559c223baed279b8ff3
font_01_sfnt_off00010425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10425 10876 bytes
SHA-256: 8418b85897c2b6debbac2d7b8f5d829de999fb3af3450f00492b788afd81db54
font_02_sfnt_off00011ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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