Malicious PDF — malware analysis report

Static analysis result for SHA-256 bce2c49553978ea1…

MALICIOUS

PDF

81.2 KB Created: 2021-09-07 07:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 3d77de20a317b9071196e82f5f15344c SHA-1: 0f0ebb41f83ca559a7d03ccf134bcc1bc9a5f4f8 SHA-256: bce2c49553978ea1ec97fe8e90ae6471770b9ddee6cea66cbc02fb9ba58c5870
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable domains, suggesting a phishing or malware distribution scheme. The presence of multiple links on potentially compromised or disposable hosting reinforces the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://kiszelyugyvediiroda.hu/docs/file/96887793775.pdf In PDF document text
    • http://amoy-art.com/Upload/file/marajewagiremazudofizu.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/vusijebuzilewatuvaxidoga.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6c9cf266633cd49ec4f118a5affa9f2b/nuwotonibaxofemorafofibal.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/fe36e16d3db6d9681635ef20d9e318fd/7193741372.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/vodekukalojikikoramiguta.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/33304932922.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/40444891635.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/pisafowumosekotuf.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/96a91cbee333eb30d479de46493e23b1/15313322713.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e549b753c---73479834951.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/nanujirodujozizu.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/2869968777.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d653f3731---ritijeteruzivobebovejawo.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1793975c8f---3912718072.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/16827137569.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/82359428564.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774c6f7c95d---finej.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/31350996804.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/bfdcc6164b3ec0c6b3355dc148f5f169/97415868578.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/80168694442.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/vaxodekoripu.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/nt1ktn8agprqjg92fkh9u2722k/funulox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=mahamrityunjaya+mantra+telugu+pdfPDF 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_off0000d21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA33 10992 bytes
SHA-256: 843cf541b8db2d04f5c1102eb016ec1d42bb625c0d12fed48a2812f437c81b6a
font_02_sfnt_off0001033e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033E 19924 bytes
SHA-256: 005bf7fcd8f12ee8e00bb28e326f45d80540943af90e1802217f795a94ba5c73

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