Malicious PDF — malware analysis report

Static analysis result for SHA-256 7243e4491e5a0c1b…

MALICIOUS

PDF

82.6 KB Created: 2021-09-02 03:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2c3785040ab27760f1730b703e70b6ea SHA-1: 2df8d520e93686fcc366bffb6d45422b1007b483 SHA-256: 7243e4491e5a0c1b5eae34fc13fec409e753215986d64a03f642ef126816f81c
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous links pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, suggests a link farm designed to obscure the ultimate destination or distribute malware. No scripts were extracted from this sample, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://callmarkinvestments.com/callmark/files/20063142229.pdf In PDF document text
    • https://kovosluzba-praha.cz/res/file/mowatopolamujuvofi.pdfIn PDF document text
    • https://atrax.hr/files/76967409125.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/61246757254.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/gewut.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/zeded.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/33947513279.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/buvamurezisewotusafami.pdfIn PDF document text
    • https://marmarases.com/upload/ckfinder/files/52561100059.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/samexesubuxemililugaxi.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ffc687a3f---wibeponinodasaziwelupos.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/b91dc5696bff5ebde0544c6df3623933/wazejipezonila.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/wutulaxizegematupudazizin.pdfIn PDF document text
    • http://waypl.pl/upload/File/95850325797.pdfIn PDF document text
    • http://septumdent.com/img/userfiles/files/80059170803.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/12190056176.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/9528bdbf5985b12669100ab76a87cbcc/72602329165.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/26688076791.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bef3d492de0---20853196124.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/12b1fe8f159c9b177fe733ce4b0b9568/3657259662.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5c8f3202---xokomifakuru.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160767facbc8bd---4605727.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160990d0e13640---18864442167.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/kiwekomobiponolikale.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=biblical+meaning+of+poop+in+a+dreamPDF 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_off0000dd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF526 10888 bytes
SHA-256: 7d7120a8fab16028b1472d34ee9b3118b64a254474309d17d002584fb2827cf3
font_02_sfnt_off00010dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD5 17796 bytes
SHA-256: 6e4b73de7f94d31303d006cec67a9db138ccb7175e08e9f5a45245ff7fad7895

Open this report in the interactive analyzer, or submit your own file for analysis.