Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e2e7bdb426dc17e…

MALICIOUS

PDF

87.3 KB Created: 2021-08-22 00:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fdb8ff75493e320625e584ded1e6be69 SHA-1: 194f979d99e8613defdfd70a10dc9e07f08e8000 SHA-256: 3e2e7bdb426dc17e15b11ef23e9ea92621e6beb84b2331a713d6734c60810c4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to exploit users via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://www.kilincsweb.hu/fileok/file/wojimupizijaxonijekupu.pdf In PDF document text
    • https://oksushidelivery.cl/sitio/public/files/file/83416183222.pdfIn PDF document text
    • http://chayka-svg.ru/files/vapeniwo.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/5057925917.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160f99e5cd587d---fapakaruvagenake.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/114vo5b5tsvgiqd42clpbs44t4/19606923153.pdfIn PDF document text
    • http://willbramephotography.com/givumetudesujomefu.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-7-27/20210727000709302019.pdfIn PDF document text
    • https://groupunsur3.com/contents//files/fedetujusezubemudomarom.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/kavudolabuzolimot.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/6438020a06947425578ac65fa3671bae/83343585533.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/a43b936b0f49d403607621a5705c0626/rozuzuwupilelu.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5849597cd---botixezaf.pdfIn PDF document text
    • http://katachizu.com/img/news/files/21129918429.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/favomapenoguzewibo.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/98450436657.pdfIn PDF document text
    • https://cape-electronics.com/media/file/wibelarovuvepoxipafa.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/89fe7ca1dd5d91d772df0ce5c447f570/pujinijewig.pdfIn PDF document text
    • http://coachhouse.info/assets/file/nukafisemowope.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/45428646410.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/si4gsl82injfvt8uhm9fcdlpor/69567274280.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/wegikulekepe.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/3acfb442deb3b428a6bedc1027581a44/dagam.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/selujixosebuxulelubopa.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16292978822845.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=jtag+xbox+360+emulators+downloadPDF 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_off0000ed9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9D 11380 bytes
SHA-256: d24bded4315896a28f63163d5f4547322a9e0bd63b2bc06c7e358f8bea0e6349
font_01_sfnt_off0001085c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085C 17088 bytes
SHA-256: fa1a1d5162d4e531c289d4279f35be9b7e8ad79f4764db2455e12e26cb51fe19
font_02_sfnt_off000134e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1