Malicious PDF — malware analysis report

Static analysis result for SHA-256 e117ba5e186c8695…

MALICIOUS

PDF

105.6 KB Created: 2021-09-04 09:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 13b07dd113d27a9e9af2ecfaa65356da SHA-1: 964cb134097b5ebe15c07d99c49f03469c5e35c0 SHA-256: e117ba5e186c8695ab08c6311ee97025ea29623176c0cb2f629c1d5695f260c9
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or link farms, suggesting an attempt to lure users to malicious sites. The PDF structure and the presence of multiple external URIs indicate a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://pistant.ru/uplcv?utm_term=armature+winding+diagram+pdf PDF link annotation
    • http://seoulsquare.com/userfiles/file/44238239548.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a444c89e5ee---51222190036.pdfIn PDF document text
    • https://netlandschool.cl/files/lutaluxenakenasesugesiv.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/detekavejif.pdfIn PDF document text
    • https://seerupit.dk/assens/file/zeverojekipuje.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/juvikesi.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/l13l2k7tsdo7j45u7c9r5jpbki/gipevixeji.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611f32c2bd338---95814396820.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cad02ae6c---xanomabi.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/zutexuz.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/mekawataz.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202108110200252024.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/mojamuj.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/518d2ec6302bacccf1633e87d050beea/64934922663.pdfIn PDF document text
    • https://ferropula.hr/files/99334536267.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/5d39759ad7469311dbad2db7ec1c5f9a/balanetoxemobewuv.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611a8391aa402---16293922419.pdfIn PDF document text
    • https://paperland.bg/uploads/file/losirejovitebiwunaxoku.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/temese.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a54e8f96067---vemubiditokeburaw.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/48071073040.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/cf83dcbfbc235dddd68ba8248cbdf6e0/reramotarolexowixoko.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/dutigobig.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/02179e7a20a22065f30a4fa3efd1c38f/97739111283.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c147d5b9c15---wakomom.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_off00013adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADC 10676 bytes
SHA-256: 24ccd480e5a0ffa8a1a1f797f9bbb9df64d8e2302cda8f4a812993e7ca8adaf4
font_01_sfnt_off00015321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15321 17448 bytes
SHA-256: 27fb4a51182a941ce7b36dcee2758fdae33f9fd8bbe54d3500272e53e9435661
font_02_sfnt_off00018083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18083 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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