Malicious PDF — malware analysis report

Static analysis result for SHA-256 bac6c71717265300…

MALICIOUS

PDF

74.6 KB Created: 2021-09-07 13:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 079f04501f85a996765c6632b739770e SHA-1: b4f7a0789efb6ddce550ffa6bf27a5ebe6e3f57c SHA-256: bac6c71717265300dc35c69e835586db7001dcc5f1c7a3af00c8fddb43c7f875
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5898

Heuristics 5

  • 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
  • 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://pixomot.ru/uplcv?utm_term=tense+sequence+in+english+grammar+pdf PDF link annotation
    • http://dezis.ru/uploads/files/fudum.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/zuxuwinamuxisanif.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/79822488880.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5eff89d51---gurodita.pdfIn PDF document text
    • http://relatives-united.com/clients/75139/File/donowitujas.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/30b50b7f7e4ca86a02284d122e9eba30/51990373468.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/foxukixogugesawul.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/38312873959.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/zubukokirolekizusugagene.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/ab2a79440dd33e8e2cca726b1e0e42e5/34130750241.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/xebijarijukugiwaxobonipif.pdfIn PDF document text
    • http://yalciniskele.com/imgup/file/robejorulagemuwax.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d56e126c17---xamujiveguwegoneluf.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a14375af807---59673787521.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/009b71692d52c4609ea784b88f9064d1/xaxitituk.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/702b22e7e1288b447a535ec94f07fc4c/pesaxosuzejamexus.pdfIn PDF document text
    • https://tavio.ru/files/file/zaxat.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/94281679026.pdfIn PDF document text
    • http://sun-eko.eu/files/file/pemasisezuxaj.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfdca4331a---35411498417.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/fiwosogifukijomobopovabus.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/kukapavokejipuzilov.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/23960dbab350d51d58384f67091b6561/20204051677.pdfIn PDF document text
    • http://gdaniec.com/upload/files/42499695774.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD943 11056 bytes
SHA-256: d7a8ed9f39b3a34dc451490d4d7d7042148e137ff8af62de6ec1f74907536ddd
font_01_sfnt_off0000f234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF234 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1