Malicious PDF — malware analysis report

Static analysis result for SHA-256 5043634b9ad1a232…

MALICIOUS

PDF

90.8 KB Created: 2021-09-05 03:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0f6bf2f0b42725ca327feff4e6897d35 SHA-1: f3e6a914d18dc607292049b02bbc3ba993b0a87a SHA-256: 5043634b9ad1a2326c0fe69f5fac17d85650dd1601eb414591193e4f7ff2dcb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external resources, many of which point to compromised WordPress sites hosting other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm on disposable hosting, combined with the detection of 'Pdf.Phishing.Trojan', suggests a deliberate attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/48d2f494dd8146471008ad1a5dfb9067/vefazaliwi.pdf In PDF document text
    • http://hzeiger.com/userfiles/file/6943384043.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/4c6649b6774cc6957e161b96c03df635/25513681798.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/rulejozamupafawijiganibow.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/ninatemojiwowukek.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766a5861d34---76195520486.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/19418159485.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a8ecb784bcd---vusanavumelujomav.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160822aa4d4723---16986256730.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f41296b1d41---pinasomimomutulezaf.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210623075232_0xfz6v.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f43ad15de9---kodevogasafem.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/62b85637376c2c5cafd29771ba66bf8f/litetaruborarezuka.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7a5058a33---dutofekepijebo.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/50937490849.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/webawedasupa.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/duvukabafanoralasin.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/voxazix.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/wejemabibomuwulavuk.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/beluboxuxenugunaxava.pdfIn PDF document text
    • http://specimport.by/files/files/27120607515.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a9136514c---kodalogekobipamom.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/62541470291.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/hdm0d2d86ep2vom7qsl8lm9ena/97910592402.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/vejaguritatomipewok.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/rufaxikubam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=small+arms+and+light+weapons+pdfPDF 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_off0000faad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAD 11104 bytes
SHA-256: d923dfa378a080b0a2c82c925c3abdecda089085843fbf850b9f79b342364633
font_01_sfnt_off00011425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11425 18500 bytes
SHA-256: a7c3639a891aaab456a95bd3445b62cb79d4285ab6dd1f397e8a15b97fab5b00
font_02_sfnt_off000144e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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