Malicious PDF — malware analysis report

Static analysis result for SHA-256 3530420f2589c0dd…

MALICIOUS

PDF

77.9 KB Created: 2021-08-08 17:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 7b6de684e554d30742ed0246668c1f87 SHA-1: 8876977531cccfda9624e2a4265412f2db7cb9b1 SHA-256: 3530420f2589c0dd5e287e21a56904177e60cbab4bb4020f6722d637a2a45f64
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8855

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://oniceh.ru/uplcv?utm_term=sociologija+knjiga+pdf PDF link annotation
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f0466e32315---27201585466.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a62f95dbcf7---zezunomamabatawu.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818eccd2c2f---18385260130.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/kumokoj.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74bccc67c3---ruxilexexepuromeda.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/jiguw.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/36836573504.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c2996ba9359---vironibazokef.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/pirigonikeja.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/447e03b35003a21804f8a6f3f6e466fb/gumupumapan.pdfIn PDF document text
    • https://ludbaegitim.com/calisma2/files/uploads/ragizagi.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddaa35cd08d---36798233568.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/hj1tork23ej4hkmq913fj6v724/mojixidode.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a14831edc26---biborexive.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160993fb733311---gaxaxeli.pdfIn PDF document text
    • http://hncastlecable.com/d/files/minifaridekejofexafabosuj.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/60adedabf0e01de0e30078320cefeeaa/40808314479.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/48059137322.pdfIn PDF document text
    • https://morabia.fi/images/file/66914310121.pdfIn PDF document text
    • https://eternalbliss.net/file/mepadawevuladenaguku.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/53807442876.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/p6qehit4aoerhs5agao32jeg09/depivasapoji.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/widaxigaxixaxana.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/82327e9e35e826b57c349a0c4cdbddbb/xuvafutopewaji.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ae00e42ed---981308382.pdfIn PDF document text
    • http://teaandtiarasottawa.org/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/visawomotuk.pdfIn PDF document text
    • http://tapestry.cz/images/file/files/debiwodofojebepumowevoraz.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95C 20860 bytes
SHA-256: e5a2e507731bc594ffa9c2eebb3d8c50e59ccf03540ec21e491f651f643607e5