Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bee8dc261b8b314…

MALICIOUS

PDF

76.5 KB Created: 2021-09-17 22:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2732bcc96c26ddfe73f102545f531062 SHA-1: 87f0699bc9f2fd3be0d5209d5aedebc7f8415824 SHA-256: 1bee8dc261b8b314e8ce97714c3a1a83d57caca3a1dc48276f7cc90c61e85b52
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised WordPress upload storage. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF, likely to redirect users to phishing or malware download sites. The link farm further supports a malicious intent by aggregating numerous links, many hosted on disposable domains or compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • 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 http://choragwica.pl/userfiles/file/27585976233.pdf In PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/nozoxonegule.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/tabotabotazudogagebupava.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/10894298490.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/sifiwuwusewegod.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/navimexizuxilibigujuzera.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/pidew.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/95807752046.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/gevoxoxivoxipixatulino.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/13842948739.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/zopazetu.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/29547776175.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109070416181930.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/11728703005.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210915/file/16316996913129.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141560014f54---77793557822.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/68752138723.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/52147152114.pdfIn PDF document text
    • http://juentai.com/userfiles/files/vozonoxinuzibo.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/95403126325.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/d3bcecb76cf1e8212832f02acc0f29f5/34674418816.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/sexeken.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423ef97e526---tefulubusuzajeferenavox.pdfIn PDF document text
    • http://klinok-saintp.ru/files/tobutipevojabapinokil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=cornerstone+church+of+the+nazarenePDF 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_off0000c692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC692 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA9 10484 bytes
SHA-256: c539b8f8696cf6b29e4ab34b5177fa83df59bac46852ee19cfa154b7ca0fed77
font_02_sfnt_off0000f687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF687 17568 bytes
SHA-256: 8781d8b4b106b9914918ee6ceaad0c867f001da47b382d4c60361e965b94da9f

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