Malicious PDF — malware analysis report

Static analysis result for SHA-256 9676da193bd4c784…

MALICIOUS

PDF

73.0 KB Created: 2021-09-26 10:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e51b8e9fe9503ad2d50aaa3f18821a1d SHA-1: 02971b9b9e57b6cfe35b8f2887b73759265657f8 SHA-256: 9676da193bd4c78488df81dac4cf1e340375283d67fa9f88f726bcb0bc7b7cd2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests an attempt to manipulate search engine rankings or distribute malicious content through a large number of links. No scripts were extracted, but the presence of multiple external URIs and the overall structure strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

Heuristics 6

  • 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.
  • 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=no+limit+drag+racing+2.0+game PDF link annotation
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/mbnlclkkma81pu8vneqm3b0b03/70703662285.pdfIn PDF document text
    • https://artbynela.com/uploads/file/mizobipofexobetil.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136466943ed9---kesituwotabatemuji.pdfIn PDF document text
    • https://norservis.cz/files/files/kodegusixulikimifujutu.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/zijekozoxajewowidoxupikax.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/63451497284.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/161486642a3083---mafimadazajafazazewidig.pdfIn PDF document text
    • http://www.polni.si/Images/files/5831856899.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/52807344118.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/61780964056.pdfIn PDF document text
    • http://jamxmpharmatech.com/upload/files/80592893598.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b2f9eb68e---gajetu.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/69743719484.pdfIn PDF document text
    • http://protetyka-lublin.com/images/wyswig_images/file/negezapifamidusudiraser.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/zejavobulejijifutid.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/desejef.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/53251047998.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/koleder.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/40803870366.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/1631317073361174552.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/dikedeloz.pdfIn PDF document text
    • https://hkki.org/userfiles/files/ruxezorubazimizope.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/ronedufodapopu.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/voturovogavevefo.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/dajubugefuxuxozesigelava.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/javexunidanuzevi.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_off0000b7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFA 17036 bytes
SHA-256: 4fffb82cab5f6e86c64c1e8e0900d49d91e2d7f9c6307d555ebbd306590acfa1
font_02_sfnt_off0000fbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB5 10832 bytes
SHA-256: 17c307d278c63d8fa06a0ca2e6bd912e39aa585f6509772805b4ae2936afb27f

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