Malicious PDF — malware analysis report

Static analysis result for SHA-256 6908d85e14eba7d1…

MALICIOUS

PDF

70.4 KB Created: 2021-09-25 15:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e122f39f40f47aaf84a4a0c5a3020055 SHA-1: 1a12a0e192438b7b5177bebbe668af5586cb5256 SHA-256: 6908d85e14eba7d187adac9527de68deb6bc989c9644208bc44046e356b4a1a3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://synerhu.ru/uplcv?utm_term=naruto+shippuden+ep+365 PDF link annotation
    • https://aodaixuan.com/app/webroot/upload/image/files/labumetawi.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16145ca6217c0d---61772354573.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/cfc0db82f2062862faddea8f31a59e6f/33628451798.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/4jo7gsfv7omretjkg6v8di49tu/sezukijofa.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/82283349454.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/fabimagiziv.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/xabozumutemakut.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/77284560379.pdfIn PDF document text
    • https://12shio3.com/contents/files/budiwanesawevinenitu.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/gamivavovoti.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/93438589474.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140b8cf7ce36---migipetokif.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136d5c4e6f78---19078070163.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/72286611920.pdfIn PDF document text
    • http://kezmosas.hu/files/file/bojerapam.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/5a7e82fa26a1fc7cb28097003c5320b0/42409493072.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/88226664989.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161404136a01a2---betetezenizu.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/84925352692.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/vijamim.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/0b3739a45e6f82610e3114936d120427/galadokibijarefanovamupav.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/wapilisipowizakebibo.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/linejes.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210916134800.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/lewodutuxit.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_off0000b130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB130 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC947 10996 bytes
SHA-256: 6b9c7be9eb7dfb916294b4fbba7a7ce057730f2c4f0aa1020080d519d9d9e352
font_02_sfnt_off0000e2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D3 16444 bytes
SHA-256: 50192da0d72d7ecbac1135492fd9a46a8c994a8a44ad267f02b62be4eb1d3dde

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