Malicious PDF — malware analysis report

Static analysis result for SHA-256 92361ff0bacd9cd2…

MALICIOUS

PDF

81.6 KB Created: 2021-09-11 17:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2cbbb50d5e36c8c1b59f43762bc82659 SHA-1: 19ae5c4fff7748c86a7525d003823fe29c7f6134 SHA-256: 92361ff0bacd9cd2be2679e15470a8a2236a02a8a2f266a3eb2d511a4e670fce
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and a link farm structure suggests an attempt to lure users to malicious sites.

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 http://kadh.kr/bobod/upload/file/lagabad.pdf In PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/a9bc6d5b1d3d47fe2d4d7c3d1f62ed53/35417581331.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/58a97197dd42f478b3c7aff972c6eada/45240886836.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161386d0e2a8e5---79589568791.pdfIn PDF document text
    • https://shturnev.com/files/foFKED/file/rasujezuno.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/gifagikiwaxudawek.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/6d4f2a0b86c6acb9867c60d393edb043/tumasiwimadobuxawasetige.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/73446373112.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/tunoremivagedapit.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/zojos.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/mowuvagifapabajutewitenu.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/ruzabemor.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16138ac27911e6---napuzex.pdfIn PDF document text
    • http://nktrading.qa/file/files/bamifu.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/20848581090.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/gagilinikexib.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210905_221610.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/busazose.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613107888b474---86822534760.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/56428211058.pdfIn PDF document text
    • http://anm-av.de/uploads/files/lofanatubisexefo.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/bimafugamunonumafo.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/kudoduf.pdfIn PDF document text
    • https://questyme.com/userfiles/file/30854295.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=call+recorder+app+android+10PDF 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_off0000dd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD09 10444 bytes
SHA-256: 7927d512083ff69809911d55f8d6c9d597e74f680f643730d42bf8948cfecafe
font_01_sfnt_off0000f4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C5 16836 bytes
SHA-256: 14ebf250bdb9c51d68f2f3f4e87217bb6dcca02011f9e9b7d13b952d98cd80a6
font_02_sfnt_off000120ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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