Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ce822657a646ba…

MALICIOUS

PDF

69.7 KB Created: 2021-09-06 16:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6f624377b384e8bef04c4582194f9b51 SHA-1: f6ea0a11ecdee7bcc686918a171c555864a6c383 SHA-256: c6ce822657a646ba3b5aa8b8f087375a53283ea7eb6cc6fb65da3d5014d09e12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ximatinhdongnai.com/app/webroot/files/images/pages/files/fenegaj.pdf In PDF document text
    • http://chaitraglaze.com/uploads/7852931526.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/010b75a175ff4f33667d031ed493bdd6/nopaxoxorenawoteziruta.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/a585ca7cb21a29202c2fd8b0f01c7903/32040640791.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/lewidifapuninulixot.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/debafagojijojabe.pdfIn PDF document text
    • https://noventa.cz/media/files/file/voparewunovozedex.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/eeb8fbb294493872d39566ce6845643c/zutopejutawukotonibazu.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e09bf1f725---dosejigi.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/8960313392.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/53101930872.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/nipidagipotosululujexamu.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/mefav.pdfIn PDF document text
    • http://gaudi.tw/upload/file/67135520819.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/witoruvimisopinamomasa.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/besodi.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/82581075143.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/35710005966.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/sufifumanedununupores.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/powunidupodukokivatunobi.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/7829068915.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///60182433008.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/37295922834.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ce5fdba1684---86442485883.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=smart+goals+and+objectives+pdfPDF 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_off0000b238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB238 14712 bytes
SHA-256: 8bacfe7846724a9b56961aa676e83e8896432326afc3957f73fc93a53e94d593
font_01_sfnt_off0000d70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70E 11372 bytes
SHA-256: f777f3008fbdcfb7790b202c9d3d3338a425ee98c5a96c4be0906a1211d45765
font_02_sfnt_off0000f162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF162 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1