Malicious PDF — malware analysis report

Static analysis result for SHA-256 634377e54e514d22…

MALICIOUS

PDF

81.1 KB Created: 2021-09-08 02:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ecc145626c0012d35296b75de48bc6a2 SHA-1: 6c81c7323476af016fcf0fb4ee2451256e2016a4 SHA-256: 634377e54e514d22c21df8e3001cce305ff938125ffac183478829b50adeb566
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to various websites, including those hosted on compromised WordPress installations. This suggests an attempt to lure users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://s-privod.ru/userfiles/file/jarebiditomalojejewofunaz.pdf In PDF document text
    • https://xn--b8qxb801j.tw/upload/files/18339367026.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/a2b1709d96fe0c03e14cace491837b51/biragi.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/6b8ea63cdb514945405a6a61853dc0cf/tuzekova.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/gedoxigoxoxelururov.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717941552e8---98258942550.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/wukoxekiw.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/28223938159.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/vikibunofufizojen.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/88683434311.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/99895732742.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/wumereliju.pdfIn PDF document text
    • http://store-connector.com/_upload_bilder/_filemanager/file/volapazukulizitufejiliv.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/fatuxikefisatujeku.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161103bf13093f---56036351073.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e27b4b4664e---vabojinon.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/nidupakedofurugolugiwila.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/buremidujujesugazejo.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/demafawamowelojelofuw.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/4775465442.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/gizevetapi.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/5f2c3e50f968635d017187c34026b53b/61172354183.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a2472974729---zatagajukewotonadotif.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/78862816855.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=laserjet+pro+m102w+manual+espa%C3%B1olPDF 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_off0000d41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41B 17988 bytes
SHA-256: 5ae756560ea3a698bae6b3dbbba376a4b256109f8279e7e1b426c3b4e6c0a3c0
font_01_sfnt_off00010327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10327 11096 bytes
SHA-256: 1e30ed44c7670e355a50848c4e2204bbd928e21c1089bb46f0924158bdad5b22
font_02_sfnt_off00011cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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