Malicious PDF — malware analysis report

Static analysis result for SHA-256 09519393e2fa050e…

MALICIOUS

PDF

81.3 KB Created: 2021-09-10 14:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6b59ac157ac386dd979e95f1198632f8 SHA-1: e8c43930c1babb920cdcf9da7944eca94ff26da5 SHA-256: 09519393e2fa050eb9cc55ed01833079c1890c73a023a7b6b6087f77d20f73cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload storage. The embedded URLs, such as the one found in the document body, likely serve as lures to direct users to download further content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131c76e1bcb4---nitilotozufaxepiveripanu.pdf In PDF document text
    • https://kede.org/userfiles/file/50149915510.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/15358543274.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/53976352387.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/15218016418.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/19832874226.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210909201509834216.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/915986901.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/wajukabiba.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/16957688935.pdfIn PDF document text
    • https://ienter.bg/files/63625569743.pdfIn PDF document text
    • http://hkacca.com/userfiles/dibedumupidet.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/kopulogifazubo.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360f350d267---gasobizuwogiji.pdfIn PDF document text
    • https://kawanmto.net/contents/files/kovimakezoxumifizuzofa.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/pekizeb.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/buxigubabijasesugomagage.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/25463407473.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/fufawimu.pdfIn PDF document text
    • http://lagrupacio.cat/file/10066234600.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/18440991718.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161385e4e5e705---40813823629.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/nufekusilirufu.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/n26bbv8bjtb0gqhf8ch12h2146/27004793976.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/59195621022.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=download+mp3+downloader+apkPDF 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_off0000d9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D8 17676 bytes
SHA-256: 971b3dea6e510e15f46a67c8aef3ae21fb7a1ffe3ea6a6118506359019b2d94d
font_02_sfnt_off00011f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5F 10544 bytes
SHA-256: 7fc87208bd548cedcbf609af5020211e7c6102af0b92e733ec6d2ac5e6888238

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