Malicious PDF — malware analysis report

Static analysis result for SHA-256 126de6cdc70e8c99…

MALICIOUS

PDF

94.1 KB Created: 2021-09-19 05:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 77b61ab33f7b5936ed03d677bca4990c SHA-1: f8ca80ea721c7ae2c06672c3854de481049f8a08 SHA-256: 126de6cdc70e8c99cc32a076236bfec6eb1e4af316a4fa9548fe33a76e25fee1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, several of which are hosted on compromised WordPress sites. This suggests the PDF is likely used to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://queure.ru/uplcv?utm_term=the+legend+of+zelda+ocarina+of+time+randomizer PDF link annotation
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614218ca95748---86090233867.pdfIn PDF document text
    • http://soupworld.de/upload/file/68189511949.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/safez.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614383a48cc2b---tidifareko.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/negaruzunepitulim.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bilimajizi.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/56750572747.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/90546165132.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/resutixawuvogozik.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/40167824165.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/sg50cfc8snu1t8celiadvqaff6/zawevivavarazomesojexuveb.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/39507160474.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/65671678572.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/f9a256efa60a883848ada23c81332349/72732561890.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/zifabuvowoxopuwobesogore.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/fujek.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/3542101662.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/8q49tjlhct3upn6fo1p11fdtc7/zidudunobenoz.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/149ca57d54cdfe7d2ae00b2695714172/1515237878.pdfIn PDF document text
    • https://soechi.net/userfiles/file/kesidodatolo.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614406ed67357---68181620852.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/vupinesulatoxunitajetero.pdfIn PDF document text
    • https://granitnet.hu/editor_up/kixoxelavos.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/kelotigiva.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/tofowag.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_off00010800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10800 10780 bytes
SHA-256: 034aac8ac1a3ff01c4df79ba2fca5a9f5585b4b082b53d05ef326121726fbcba
font_01_sfnt_off0001206f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206F 18448 bytes
SHA-256: 58f32858565c5fc85b9c3e497355b40931da4524c09d03e59b6929ea6f26ef6b
font_02_sfnt_off00015070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15070 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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