Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cb64a9bc7a9b15d…

MALICIOUS

PDF

77.4 KB Created: 2021-08-25 01:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6e752f013bae55ac4169f0eba97bd4eb SHA-1: 89e0eb9502711c94890b5fdf24e4dde78dacdb62 SHA-256: 2cb64a9bc7a9b15de5cd7a013bf937c33b19a3a95d15208d86eade5d82200ad3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to external websites, including those hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the structure suggests it functions as a link farm to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://adria-ex.com/images/blog//file/karitigurosozugigixixola.pdf In PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16089d3fcf23b0---gosezesetobediduxonuveg.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/padozotudapo.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/39381742940.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/gatazedomapowox.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/wejimodexojegiz.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608b99fb0b663---tamumokagug.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/bukoxopoliz.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/zagilinejawosigedutibe.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/fumuzemuminoxaniwozibopo.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/89305254070.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/xekawi.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf47b0490e---fexivajiwowoxanekofokux.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d63f277449---36445139808.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/pipulafaxisifufazerifixas.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/1839637782.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfd587d513---rexibef.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161255d8aa9dd3---fibuf.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/54806944408.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/bafenutirumusavunubesozo.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data//files/sofuruguvivekesi.pdfIn PDF document text
    • http://runo34.ru/attachments/file/gugasezufisa.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/batelazeximinoz.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/besaradedovudulapiduwazav.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/2712b334fbf02a5c99f72c091c4b1258/93281945156.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/panezigaveji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=golden+dragon+bbq+%26+seafood+housePDF 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_off0000caee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAEE 17508 bytes
SHA-256: 534a32d3950141b4cb96aae183fc7f6811c1f76dac8ae5a12ad3db814286a1bf
font_01_sfnt_off0000f8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FC 10388 bytes
SHA-256: e23b95a3876c4f835a6607dbda8c2fc2ff6f4d15badca963951043a21c01a7e9
font_02_sfnt_off00011010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11010 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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