Malicious PDF — malware analysis report

Static analysis result for SHA-256 9285ba87c7209861…

MALICIOUS

PDF

83.2 KB Created: 2021-09-21 02:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5b54cd883314813a9bda5faff6811846 SHA-1: dc5131f52cc4d3cb99074d2195dea860b4bddac9 SHA-256: 9285ba87c72098615915a71723ec98eb60a3383b178f532dc30066df82f52625
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier flagged it with high confidence. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites, such as feriaesotericadeatocha.com. The presence of external URIs and link farm characteristics suggests an attempt to redirect users to malicious content.

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://synerhu.ru/uplcv?utm_term=sending+cv+mail+format PDF link annotation
    • https://wronba.pl/uploads/wysiwyg/file/woxufinorukivo.pdfIn PDF document text
    • https://successalpha.team/upload/files/vubosovagawogonolag.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/jijalu.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/patanavoguka.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/96516111477.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/nowakapelikopusukewurew.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/18002861382.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/72516531718.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/buwomosatelolapuz.pdfIn PDF document text
    • http://thaoduoconline.com/userfiles/image/file/16626523986.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b562804a6---31339416165.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/87754340311.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/23858698862.pdfIn PDF document text
    • https://ipkameros.lt/userfiles/file/42675314169.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/50776573449.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/fuwuzopesifanof.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/aa9ls09fng36l07h8qh7b7m94t/90872998758.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/kiveva.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/kokotorirokufurikonu.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/53589729770.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/xozogunukura.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/wilisuguwusozazuj.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/fb7bf4d0f45ead1edaf3153a9a296221/xofeponanowilunogoro.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/wemufavovew.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_off0000e12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12B 10792 bytes
SHA-256: 19ec2c0e7154baa9a79eb573bf6554a0e51bbbb7cdf0fb9d661d7987be36ee72
font_01_sfnt_off0000f9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D5 17552 bytes
SHA-256: 33433b04bdea57989b01142a2aa822fa8d20e3b2e84caff91201b1708988d6bc
font_02_sfnt_off000126dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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