Malicious PDF — malware analysis report

Static analysis result for SHA-256 c367d270d887235a…

MALICIOUS

PDF

86.3 KB Created: 2021-07-01 14:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e18eb593afb8645e34db49c1963fce79 SHA-1: 671f51b9186d0c58d8da78a037b217d16e740762 SHA-256: c367d270d887235a2b762c98b07c333f54f5445f841a125fa271e41ee0077736
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites and other disposable hosting domains. The embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://ketchas.ru/uplcv?utm_term=true+facts+about+the+aye+aye PDF link annotation
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca1367af6b---95932709488.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/legunaxemolelorefogulit.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/9796857056.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/e916b838ebe068467038d1fb13232d4e/fapizafevudakinabunov.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/fadebifujixukevaru.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/50904604936.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/drskerthpen2972j3c2aai5if5/vowuraleradimewesafi.pdfIn PDF document text
    • http://yongqingtech.com/d/files/wetovutul.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/60391509116.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/d6gglpe3g5mukkrq5euc740irv/ponaselozimifolijodike.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16089841f49ec6---82031093625.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/6811331639.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/90521145574.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/fupuropazotedigowigepi.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/roguxezuwuriwuwufope.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/69358285373.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/42845353301.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/giduvazowuzi.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f52aafaa0449e6f9a40c03be3d13e042/fisobezasijexitubuw.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/zojidezifosojokokofaneduz.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-1/20210501110356370129.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160828e5ee7ec5---ribosadarixigopa.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607feca5e8d56---905428080.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_off0000ee6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6C 16832 bytes
SHA-256: 9ffdd21511bc6430ba3c9bd6a97c04ec279787e3f31c5e2bcddbe406291edf5a
font_01_sfnt_off000119ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FF 10508 bytes
SHA-256: 82bdd56710cd23030895fc6a1412cda0a8d7a7e743ec0a3b332ad2b623a0a533
font_02_sfnt_off00013229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13229 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1