Malicious PDF — malware analysis report

Static analysis result for SHA-256 61eef50821d1e15b…

MALICIOUS

PDF

88.0 KB Created: 2021-08-13 10:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d1e1fac161e23e646641676dc5b17394 SHA-1: b855e3fb9b174b4a83f0cae15a54de058c8a7472 SHA-256: 61eef50821d1e15b8febadd4d451352d7715665a03afa8133312e5289d3eec4c
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 that point to various websites, including those hosted on compromised CMS platforms. The presence of 'utm_term' parameters suggests an attempt at SEO manipulation or directing traffic for potentially malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://taxforce.nl/userfiles/files/89810710728.pdf In PDF document text
    • http://asja-doll.ru/userfiles/file/55953465351.pdfIn PDF document text
    • https://mszukam.pl/dat//file/35789560427.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741a4abb336---85039533471.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/99702651c763b4d16a3d0b014af2857f/xafowunapi.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/gabedatefit.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/fuc2umj4tp8both6rikdb6moei/49217257508.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/17597214132.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/97094078903.pdfIn PDF document text
    • https://buyafranchise.org/files/files/88402975246.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///xabuziwemeloferisod.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcdd97a8a57---muxukunojetikeju.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160ab684087bc1---54055026201.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd945522ed---15006341251.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/3df4ae7797c909ede8953c16a7feed8b/13749252416.pdfIn PDF document text
    • https://zzwgjx.com/d/files/46298493061.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/lumegajinajanufomupumuk.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c199f1df766---53245699204.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/196f3e84ffed00a653c2aaadf7c9a98d/78110221034.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/metenoxulub.pdfIn PDF document text
    • http://tecumseh1962.com/clients/85183/File/36144754332.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/lkgtq218ssfpcmhb77p8g9pkf5/nowunej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=free+printable+reading+comprehension+worksheets+for+grade+7PDF 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_off0000f263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF263 17024 bytes
SHA-256: a830794fa084b50369022631a5ff09ab823696c83f194c602b6e057aa843c394
font_01_sfnt_off00011eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB2 11412 bytes
SHA-256: 8614b726bcb542efa767f3de11fe93ae13eff89aa959af4e2fa363701e1c77bc
font_02_sfnt_off00013910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13910 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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