Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c6c9e8f010148bd…

MALICIOUS

PDF

82.9 KB Created: 2021-07-04 20:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 86ae76d0a14bec1cfa0dcb52c354ee66 SHA-1: 241442cfc367092390748d347aff7f4807828fe8 SHA-256: 6c6c9e8f010148bd4fc7c31014f91830c16d48b0e41782a9719bb46ecf83d4dc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://ketchas.ru/uplcv?utm_term=gratts+learning+academy
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/50554706d474b531dcece5555c7593a4/73584209197.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb3c9c8b43---60300810888.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/547af257ba54b85c62d11111ae1a6039/9533734305.pdf
    • https://linhquan-group.com/upload/ck/files/56360639117.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/a6e913d17ac1df91d2092d371a6a2308/fexabapakipikavug.pdf
    • http://btc-ltd.com/upload/file/tejugamatasapijivomebunef.pdf
    • http://alnoorcity.com/userfiles/file/rimaruvele.pdf
    • https://hospvetcentral.pt/site/upload/file/17051606749.pdf
    • https://aquafilling.com/userfiles/file/nurulepiwivasozunutufila.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c33b2af94---sinidovumozelov.pdf
    • https://gilbertems.com/videos/file/poroj.pdf
    • http://cayxaotamphan.net/userfiles/image/file/boxifaferodize.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/ot0fvmibpnnj08h5l21i5ed1vq/rugivosidobudakimaru.pdf
    • https://lapalettedesarts.fr/gestion/file/5865728278.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0fc823ceb---tezefibabiku.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb95281651---90330223427.pdf
    • http://ibconsulting.it/userfiles/files/juter.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/449dded79dba9131f82f42b8c9710433/lilepuzexewufutunemisamul.pdf
    • https://powermailer.in/userfiles/file/ferusuwesamozo.pdf
    • http://anhuicrew.com/upload_fck/file/2021-5-1/20210501125820689553.pdf
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/0d4884f8be503e3c46a3fde96e666f93/9701165761.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c2358bc08---sasamatibezekuwukugazita.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b73f2f593---galumazojomemaziwumoragiz.pdf
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2106130431459788979p3axt.pdf
    • http://angelescare.com/userfiles/file/13794584232.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd0f.bin
03156e9d30f1f841446307ae3802a0bbec16836997766f722f4962b299f25b2a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0F 10748 bytes
font_01_sfnt_off0000f597.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF597 16792 bytes
font_02_sfnt_off00010da9.bin
af43d2ca7efb382b4607aeaabdb4d7fe28b6dace93194b358a6a7cd354206e57
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA9 17776 bytes