Malicious PDF — malware analysis report

Static analysis result for SHA-256 d670d1253109b45c…

MALICIOUS

PDF

78.0 KB Created: 2021-09-22 10:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 43bbb7f00538dae2715dbdd97090d2a6 SHA-1: 5bf7f243cbaca05762ab84237f0fc03c5eb6bd87 SHA-256: d670d1253109b45c4a466e1ffc6c1c34a995cf5c339dd2805f47087f8d96a99b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the presence of compromised CMS links further supports a malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://praktijk.zorglink.nl/ckfinder/userfiles/files/fezapebufotepezu.pdf In PDF document text
    • https://stillwaiting.org/userfiles/file/66225894000.pdfIn PDF document text
    • https://andrejc.si/files/file/zajexigofavipe.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/33641411763.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/dazatupukekuselujojalil.pdfIn PDF document text
    • http://mastervin.ru/files/file/valolika.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/milem.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/kupabogilijalipu.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/bagedopawurafabavepaluvon.pdfIn PDF document text
    • https://dd-inside.de/userfile/file/zevunipujumumovosizobake.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/semibovagijudogebafeve.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210902082228.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/82052764112.pdfIn PDF document text
    • http://torby.kbo.pl/ckfinder/userfiles/files/vefuvakimekijeji.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/1880000689.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/b4dd20182e1c70d07b80e187023c6814/92825826069.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/firifanawosezok.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ad327b6f1---vividikokewamikedodetimi.pdfIn PDF document text
    • http://terrietanaka.com/library/files/bogefavevasagurugujiwu.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/52730331327.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148bf8cd84a0---wamorapovipuzisoju.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/42824797957.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/kazafinotepevunibaroze.pdfIn PDF document text
    • https://tmtteks.com/files/dazivamamajososoxem.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/folizatolusurepodip.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/sowivuji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=pirate+bay+proxy+vpnPDF 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_off0000cdf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF6 17624 bytes
SHA-256: 79438fdf17740d579d327446b49717dfe1c574322b69281dc784d9da32d78225
font_01_sfnt_off0000fb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1D 10452 bytes
SHA-256: 4e82f7392d37ed072e13cc9dadfe484ef11cce9f34b29ffe78374801516d2227
font_02_sfnt_off000112d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1