Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dc3e88c7f9c8c5d…

MALICIOUS

PDF

80.2 KB Created: 2021-09-17 23:38:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cd0138a2d483457b9d43dd36bf0b8d46 SHA-1: 641a93817d003e0e364c021e514c5551bbea6e02 SHA-256: 7dc3e88c7f9c8c5d662467e51c4a26e8983d933d220e1745159d88450e13826e
96 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of its harmful intent. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • 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://polenhosting.com/calisma2/files/uploads/28350468367.pdf In PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7bp75qrfgr67skmid7dnbra6o4/muzasutazosix.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/rolinivoniriletori.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/63921476429.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/faxuxupetifup.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210909_c1923.pdfIn PDF document text
    • http://autofox.lt/ckfinder/userfiles/files/20952421876.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/7913085993.pdfIn PDF document text
    • http://waypl.pl/upload/File/berumezizuwita.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/7082165099.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161301c1896b4c---kulavokiwuzedet.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/zakul.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/63110c9cb24a59be3b921b18cf5d4328/xarodotul.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/lamokijoxujalofisavuxer.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/xerofuxagufe.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/8276873854.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/benimuloweviwifit.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421f0652776---xezawevopi.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/6051f6d0ed7cf2d8862dd367b2fde83f/26628375813.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/94245746584.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/42125730814.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/taninanamodabigovikesa.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/68525389354.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/1dda35ef4c318808ae715db299224f8d/gozukorubepapev.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/bulur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=pixel+2+android+11+release+datePDF 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_off0000d60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60A 10516 bytes
SHA-256: e0fee9d6d4038a07d7c4d3af87ec17ab2884775710159edc37d4dd56f6ad5565
font_01_sfnt_off0000ee2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2F 17308 bytes
SHA-256: 726fbd6d6b664488e99f1802af3e24e811dbb04fb61e4e980cf0012058e8fe24
font_02_sfnt_off00011b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1