Malicious PDF — malware analysis report

Static analysis result for SHA-256 72610c951221371f…

MALICIOUS

PDF

72.0 KB Created: 2021-09-25 17:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5e313b956a0b2b8710ef17e5bc6a24b1 SHA-1: 2ae27fdbefd5105dfdf676bb46646b645adae5de SHA-256: 72610c951221371fad9b275afcb14f1c78195d7d6dccacc2ce8f2ae986913a51
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to various websites, many of which appear to be hosted on compromised CMS platforms or disposable domains. The primary purpose seems to be directing users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chcial.ru/uplcv?utm_term=when+we+were+young+old+song PDF link annotation
    • http://www.firengo.com/userfiles/files/83973754103.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136acf6597b1---61139930539.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/bukodijez.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/73304518487.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/8d97i0v2q9pqqi2frs4acj5rfp/didisagekejevom.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/47inc6b5m6arv3g88ej87muc5m/46196040171.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b32213739---41266770792.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/3832317906.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/winizejoxut.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/25518721655.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-7/20210907100005479231.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/11661860970.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/nutibekafi.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16131a137dd3d4---84506651855.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/2f240f48e161e07fbc8b7485c62463c5/wazeduwi.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/bujezadimajat.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/mofagulajufoluvejofifuno.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/90074179301.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/28906810043.pdfIn PDF document text
    • https://majubesar.com/contents/files/95155319609.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3afd26100c9ae5f9e2997610c6c65c2e/33239831836.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/gatepim.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/51409040978.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_off0000b21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB21D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2F 19088 bytes
SHA-256: b5f2481453fffa5932f1b72b279f189a0cf190fb8eae437ea4cf703c6f26f956
font_02_sfnt_off0000fb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3C 10468 bytes
SHA-256: 54e82a9b2566f091614252641a936bef264b3bac455742876f5948bffe391936

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