Malicious PDF — malware analysis report

Static analysis result for SHA-256 e71a25eacba86f94…

MALICIOUS

PDF

78.3 KB Created: 2021-07-30 15:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0068c985744f952decbdfe78d7e688c9 SHA-1: ecb5c9f52aa6932f7b13c0a5fd00c58ffc61a7bf SHA-256: e71a25eacba86f94433410872e3e0694fe674af5ccdc3e27f6955c166903aba2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URIs and a high number of distinct hosts indicates a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://madmojo.com/fckupload/file/vakipozarowikew.pdf In PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/324043051019cbe6472d19e3bcda81a9/70306671064.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/lejofekedorarubanapekes.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/8270395360.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16073d8d487a01---17303851323.pdfIn PDF document text
    • http://lg-palette.com/upload/files/26494313263.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/uqdfg3itcf2s36tsst7jfpna7f/takuxowatiluzobeweraru.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/78b434851139113f91863fc85ecdd21a/19346150037.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/42681178170.pdfIn PDF document text
    • https://tavio.ru/files/file/41927856455.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609845b434ed5---gimijibilibufizupuximopid.pdfIn PDF document text
    • http://artside.org/data/temp/file/ratupilejuwojewozul.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091b1f391dc4---lexuronudezig.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/f2238a73a4c2ded56792706f33055750/tofopijefesidugutasam.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/15794238620.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/kspi88rhosvv5snaitae25p0qf/xewamawufutafawesizegekez.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/93165692e711c49597a2c23305531017/92515101756.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8bdd08e61---juvobilevaj.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///93114339601.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/8648244017.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/totidedixomidejupesar.pdfIn PDF document text
    • http://godswaynehemiahmbc.com/clients/878002/File/dopowiseke.pdfIn PDF document text
    • http://cecev.com/stockages/files/xosarifabejovasunexo.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090e3da51a65---buxamukajimubaberulotem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=paragraf+soru+bankas%C4%B1+tyt+2021PDF 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_off0000cdb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB7 17560 bytes
SHA-256: 6fc1f713a30350dd3722e89b0e0adb3a9593ed20b261562326e9579604f930cd
font_01_sfnt_off0000f83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83A 10904 bytes
SHA-256: 585bea905f9a4fdf970d8fbc05531268ab1ca6641fa1c43f65e2c708397daad4
font_02_sfnt_off000111c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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