Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e53957c20d655fe…

MALICIOUS

PDF

75.1 KB Created: 2021-09-10 21:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dae94a0a3d0c59975aadae3645b38b7c SHA-1: c67a51c884745003cfc8137de692336ae4606eeb SHA-256: 7e53957c20d655fef4aba1475725fd860422166731c4bcbfdc4d2f12ae585887
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites, such as http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134dd193985b---doninisowusaruvejujeguk.pdf. The presence of embedded URLs and the overall structure suggest it's designed to facilitate phishing or malware distribution by redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://angelascanu.it/uploads/file/54683482532.pdf In PDF document text
    • http://strap.sk/uploads/file/50552777902.pdfIn PDF document text
    • http://flexa.cz/docs/file/35493498972.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/98167899762.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/miwuruwukoluwajawezi.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/70411066767.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/83410544097.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/9063466735.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134e2bf2475b---wakovuriragazimowovot.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/54180558431.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/hcb9ueatnerr3td70ahic5poga/39463293554.pdfIn PDF document text
    • http://15881588.com/ckupload/files/bugiguriwuxikajuxokegede.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/kenamujekipivodus.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347aa96a815---23539578489.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134dd193985b---doninisowusaruvejujeguk.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/88552006919.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/valubej.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/83231981558.pdfIn PDF document text
    • http://snft.ro/media/file/46652203214.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613a921d3185c---rilim.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/48033191012.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/kuxuwelikunikugitib.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135294568bcb---puzitajilapizonusomubuza.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109091815237561.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/gizivemetetozuvekex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=the+curious+case+of+benjamin+button+streaming+vfPDF 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_off0000c0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FF 16868 bytes
SHA-256: e1de8a2c4522ad00cc24ebdf51a8f57dfbbe3abbc4c73c2df8b94767b21c407c
font_02_sfnt_off00010472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10472 11136 bytes
SHA-256: f625cfc7642d96498ea942371ec8e7941db3a74ee5f57819aa6de649e0075bbc

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