Malicious PDF — malware analysis report

Static analysis result for SHA-256 76922a9acfd5a36d…

MALICIOUS

PDF

73.1 KB Created: 2021-09-05 12:32:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 639e87e20061510baaaa213bfaa5b014 SHA-1: 3bd246cd90f0f17b281e39231042dbe6d3b0d4a7 SHA-256: 76922a9acfd5a36d264f3444ee7273c19e696f5552799fee87c61f072bc9f4d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or link farm attack. No scripts were extracted, but the presence of numerous external links indicates an attempt to redirect the user to malicious websites.

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 https://oniceh.ru/uplcv?utm_term=pmla+amendment+act+2012+pdf PDF link annotation
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6532132c5f100db143fa6a1bcefa52dd/94759672667.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb60a414f83---82022013223.pdfIn PDF document text
    • http://taniaandjohn.com/clients/874109/File/bewivano.pdfIn PDF document text
    • https://stopserv.ru/files/file/47390245141.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/e9bc6f415b7f1623a8669011e2a99ded/27366143314.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/beduf.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/50500124478.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b15204c0d77---zepanepezesiwufaputo.pdfIn PDF document text
    • https://digireg.cn/upload/rebozekibu.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/zokisus.pdfIn PDF document text
    • https://digiconelectronics.com/media/82580277794.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/41773481007.pdfIn PDF document text
    • http://topstec.com/d/files/gunipipapezanurugoxala.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16129523be3207---13198426287.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210604131029.pdfIn PDF document text
    • https://doitoutdoorz.com/file/VnZjIhMNsyfC72bN.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/luwewo.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/bugizofanitazilixoderipiw.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///vadesuxu.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/t5v9k0sppg05t2cluqkp8oso3p/josifisitenije.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/romif.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/davizajosuxipukelebotewez.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/87659142404.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/34852599141.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_off0000b70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB70F 10596 bytes
SHA-256: 73fbabb79db269de9d53591d279cff7c12c214fec9d73f10c9304dbb823f9fdc
font_01_sfnt_off0000cf50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF50 18316 bytes
SHA-256: baed4fc946a7ca21ac66cfe497ef6b97ffda76b611f1b064e1f6cb89b646e734
font_02_sfnt_off0000fce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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