Malicious PDF — malware analysis report

Static analysis result for SHA-256 9064b9e403a0f4b4…

MALICIOUS

PDF

82.8 KB Created: 2021-09-15 18:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a26ad60b70e534f64bcb94f230d5a093 SHA-1: 5cbcea6dc0d7656eba58ed9b8e3d81838fd9e4ee SHA-256: 9064b9e403a0f4b4e44e5bce3f239813d4a47f6de04bddac8cc980230c4e5b61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many pointing to disposable hosting or compromised WordPress sites, suggesting a link farm designed to lure users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nomylo.ru/uplcv?utm_term=gomovies+download+app PDF link annotation
    • https://ixiu-23.com/uploads/files/202109150651081172.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/vobusinisutanozarerasud.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/vifomosulorenedaroworiji.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/42504084075.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/4d5aa7b3f8ac45375d2d655479c0046c/roxezukuwudizunuvoruxig.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/53330446108.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406c5822fbe---42319867245.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/lofokusopebazisapidodo.pdfIn PDF document text
    • http://hotelpancharatna.com/assets/userfiles/files/wozub.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2d36d8b58---75392979715.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c94b174fec---6304654822.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/33222200331.pdfIn PDF document text
    • http://climtech.com/files/files/28333108925.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/621732eeea68d1665f76e92d0befe1bc/41441115805.pdfIn PDF document text
    • http://eventpro-kontraktorpameran.com/uploaded/files/xuwaxalidelamuwa.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/43663780654.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/zinukeru.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/68182943298.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/zijowotipobuwit.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/gilikazikesuxewomapigono.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/jojak.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/ec0eb77da7188124efe2ffce71a9a77e/suvekukokidejifene.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/9503770055.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_off0000df28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73F 10544 bytes
SHA-256: ab0a26cb144197658e08ea46806c9d4bdc1bf1f2326739ab38820e5fc43dbc12
font_02_sfnt_off00010f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F50 18052 bytes
SHA-256: f02ca83fcc70ab7095c9786abf86bb60f61011bb80db5b9dd4a48c0fd50aa96e

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