Malicious PDF — malware analysis report

Static analysis result for SHA-256 e398f87e31b48b41…

MALICIOUS

PDF

84.8 KB Created: 2021-08-20 14:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c4f2c3eced66ec55e964ad202de40a97 SHA-1: e4fd6a015a6ae40a6be86d4e409ffdace4666ca8 SHA-256: e398f87e31b48b4161f38795997b2459c55eded7606b3eb257bb6abcba613642
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, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting domains. The presence of numerous PDF links on potentially compromised WordPress sites and disposable hosting suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://fd-health.com/upload/ckeditor/files/26127465690.pdf In PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/588e9157756d57cd673924c0d41a3826/42740351801.pdfIn PDF document text
    • http://mdc.ir/ckfinder/userfiles/files/jixunefutorevudej.pdfIn PDF document text
    • http://akhsmombasa.com/clients/861898/File/pelimizasidejeg.pdfIn PDF document text
    • http://minipit.com/data/files/48457034921.pdfIn PDF document text
    • http://signauction.net/userfiles/file/71769984669.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/fawurijivapidimupudadu.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/71ccc2acb1277b0513547be610888b38/filoju.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/c3be8828ed58be6c520350fcd530150e/15588782087.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c335d412f27---banavatutenag.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16111f5c74573a---57222958056.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c352537c450---velusevapugutusuboxelu.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/68834ae8e8100639b49adc9e89307138/39606495224.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/6018805937.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/34041577603.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/7c438b3dd38df9831cd66e9196320d6e/50601665697.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/tv71llvfdmp9mj5uh137ap5msj/65283959383.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/83685036547.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/65808081091.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/2812273126.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/4945221109.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/84336979086.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=computer+main+pdf+file+kaise+banayePDF 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_off0000e377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE377 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB89 17308 bytes
SHA-256: c77511d72f64adf494f5db44a7dc240f5aeb2fac707a810ff44671ad5cabbf40
font_02_sfnt_off0001286b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286B 11136 bytes
SHA-256: 49064f076d97d30395ea2d283ca8559451d660cfc22966123f7ec24301bbbf83

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