Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1355e645fb3c80c…

MALICIOUS

PDF

79.2 KB Created: 2021-09-03 19:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 34ab05d1bfe7e69f5947f304429c557f SHA-1: 680c41f0ffba6092010fb1dafafb3f89ce4c19ca SHA-256: e1355e645fb3c80cf43c465061da8a9b6e9424a9d94daa9e9c3257804e9121c8
204 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The presence of ML_NYX_PDF_MALICIOUS and ClamAV detections, along with the high number of suspicious URLs, indicates a strong likelihood of malicious intent, such as phishing or malware distribution. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=whirlpool+gold+series+dishwasher+repair+manual PDF link annotation
    • http://mnwebdesign.dk/userfiles/file/biliwoduvinusasivex.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da582c715fe---tuladavewu.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/woxol.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c181dcb16e988df1450e2eecd949e6cd/kuvaxasoketarujabutup.pdfIn PDF document text
    • http://espokebar.com/uploads/files/1488308714.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e1b550be6---tatevigurab.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/16433374561.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/60802114861.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/70395541231.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/ovfs841ff5hbsu4egf986nbe14/53895029872.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/17129692867.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/58916526050.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/berugifekaxoxoxug.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/doramikowiwaje.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/vevokuruzesonerofa.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/2d74dd9f5870cb100ca63479ab1a2da7/55800774486.pdfIn PDF document text
    • http://kme-kme.cz/files/file/10771701125.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e93b800ed75---35224629722.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079e1fcc5d82---72464478549.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/3v40gtqssgtrt7bb1epfkf3dg6/48715354290.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/bopojenituzax.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8e0fe4b60---2876279762.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/8aaf198d973cd95f0b7c8d5501511eb7/tevijulinewetumo.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/0657484cee0aedca0b43949a49a1d787/12566570950.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_off0000d213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD213 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA25 16848 bytes
SHA-256: 7093cdae6a6d893f1ed956773fb0446764b72ad0c35d30ced290cf2da35641cb
font_02_sfnt_off0001158e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158E 10920 bytes
SHA-256: 627ecac1d642564b50f618958b30516327618219471b0a2f2643d7e0ec107428

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