Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a7311dabaa5566e…

MALICIOUS

PDF

79.3 KB Created: 2021-09-01 12:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b25c196274593d767e5d5563fbef8fa4 SHA-1: 8210975bff92b95811f5a507bc96389c4152d604 SHA-256: 9a7311dabaa5566ebda51e8b26a1acdace8994e1cc91cd6ef7210b9327f7891c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/90291846168.pdf In PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/kawuwifosomazulipopulo.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/volakon.pdfIn PDF document text
    • http://haokunchem.cn/upload/files/vowulegune.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3f20cdb4d---dijudutodirizikuzana.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/nefimigogijejemoxi.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/40028543491.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/3a369da61bec8934913d056e79a3c4aa/86845345011.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd45b14c17d---wekogiw.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/dulanefem.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/tijido.pdfIn PDF document text
    • http://luatsutiengtrung.com/app/webroot/uploads/files/dekexaz.pdfIn PDF document text
    • http://hermangroupcorp.com/clients/3/38/389628ddbd62db2fa1e4299ecdfc1861/File/pabekufisu.pdfIn PDF document text
    • https://highrise.pl/file/33095637378.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/zedineger.pdfIn PDF document text
    • http://wjcopy.com/upload/files/zuvukabiweliwubuwakeju.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/vowuleguril.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609098e95adea---zalitefugejopo.pdfIn PDF document text
    • https://rm-parketi.si/uploads/gimadefid.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/50235977646.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/mivaxupigasubewaroparaj.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/nudifebetadivojotogojuza.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/gataloriwilum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=cima+past+paper+answersPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7fa585b87---48829839904.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_off0000d279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD279 17696 bytes
SHA-256: cfaf1f8ef646d19b062a56901e6834d37e672c79bd3be8b9e0ac490c9b0d7e15
font_01_sfnt_off000100bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BF 10364 bytes
SHA-256: 43f611904c906a7cf02323450904933654c35926063e1fd5dd2aad766fb807cb
font_02_sfnt_off00011839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11839 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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