Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae99e7aecf44e223…

MALICIOUS

PDF

73.7 KB Created: 2021-08-30 12:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 514dab092b8f4472a6599fe4e869d594 SHA-1: 5a1ec0b84a4abdf650aa62b745db81fe57a493ea SHA-256: ae99e7aecf44e223a103ea53df75e05fcd34c5e2f50c1d0a69426d943c16fbb9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/ljq588at2tdl2ntqjfvijcsjq1/ragalapefulefufawo.pdf In PDF document text
    • https://mo-space.space/web/img/podborky/files/zidinefosoliga.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/kapititugidesi.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/43de2b6f020e50e9b9cb5323cc036626/kinot.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/22182733456.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/lipitizamitaj.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f590b1c76f---71263977189.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/rifemesitesometezawomasej.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16087616e0ccb5---10586898656.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079f4135edeb---39025588512.pdfIn PDF document text
    • http://masseydogs.com/clients/f/fc/fc2e217ffa4851e49ca3cd921a15cf41/File/41488508957.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/nefidadisapixide.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/benutelurozenobux.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/78269414287.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/36214879254.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d75d722ca---5401263788.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/vevoririkutonamiz.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713b48b0d13---85670478535.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/wiwezirariru.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/20144298291.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/semaveveruduvujujodidureg.pdfIn PDF document text
    • http://ducnhua.com/upload/files/zibolaxumuvepurunerapi.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adf66ae8550---65801642484.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=if+you+knowPDF 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_off0000bf4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF4D 9752 bytes
SHA-256: 4347d3c96c694ef17366b47bb0f48c31689bc43e6b660dc755d122c8ccbcd972
font_01_sfnt_off0000d4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C7 17524 bytes
SHA-256: f6db39d19c3ca1f1ddf364c94ab79c445d383e4b605040c8fcd40ba8375c4dac
font_02_sfnt_off00010122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10122 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1