Malicious PDF — malware analysis report

Static analysis result for SHA-256 10127cd6c80bd17b…

MALICIOUS

PDF

76.5 KB Created: 2021-09-01 16:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e158cb8c1c4533dcb5ef4a8b416b9439 SHA-1: 1903a789dc296ea6e4af73c5f4d87ca92f3467eb SHA-256: 10127cd6c80bd17b1082d1593d088f55f36d48503ea1dd4bf2f3335295a702d1
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of multiple PDF link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/b673606f68300ab9df3399c62faecb81/kojoxigabekedovetox.pdf In PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/nofofavipu.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1609405d981dc2---21815619486.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/xewirerig.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/39685053521.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/68370723964.pdfIn PDF document text
    • http://kuppersbusch-center.ru/uploads/files/66559177250.pdfIn PDF document text
    • http://sciattella.net/images/file/96169008266.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/gizenabilirupominuruxija.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/lejojitobivage.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/32c3a2f14c29689fcd28bc525c0ee83e/vapimebanipevalipunekos.pdfIn PDF document text
    • http://lyonsmcafeereunion.com/clients/a/ab/ab8eb7fa8d7cf94b91f67e7e346c80ed/File/duvarevozefez.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fde173bd1d0---kudesuwusotiripakaz.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/d1o9seajsu6r29lhddlcjq4p85/sowebowotovimejumop.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/bcd8e67934724c9d73ddee94c40d85dc/45958805670.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/32330644547.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd6edd8b32---nisupipunerolawuvesadarej.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/goratemumuwifileregapukem.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/karagatajo.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/bovagovalasexamexuxoju.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/15f7eebb52c80e69b295e1a1e3f7e4f1/worotawowipik.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/72467480108.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/wixizodatabaseg.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/44644938733.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/42706611100.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=smackdown+vs+raw+2010+unlock+all+charactersPDF 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_off0000c4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFE 16952 bytes
SHA-256: b3cfeb0131379a660f8595872133f765b9bcf0cf3386e50dd8ec77c07af129bd
font_02_sfnt_off0001086f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086F 11256 bytes
SHA-256: 84e4ffc58b6ba5ef1d09dcbe34335dd814c75e08875ae5032a26094b983069e0