Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebb4fba194b65641…

MALICIOUS

PDF

77.5 KB Created: 2021-07-19 00:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c00bd238d0925260b74b50606c21a052 SHA-1: 5f0b8997d50dac5daf3b2192918f0a1ad4b97faa SHA-256: ebb4fba194b65641f6a75323f6f85d871e76133ae1bfe632e8858450b0f41069
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute or redirect to malicious content. The PDF structure itself does not contain readable content, but the associated metadata and heuristics strongly suggest a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bd537e9c597---sadowu.pdf In PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608362aca1180---zaruwanodurulerupufodu.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccac6df44a---xisofudupopazakizovus.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/11115897685.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/2ecc9aeaa74821f776cbb816825b6846/bumuwaxizazaja.pdfIn PDF document text
    • https://granchefpremiumfood.it/file/setiwapusuvulujed.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/nmipqk63tttv6j13r08tv2fj1f/zovubuk.pdfIn PDF document text
    • http://esistore.be/userfiles/file/sebutudabutirusufo.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/denilijanozare.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/24341204502.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/28590929233.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/913f08e170c37146627771eb0a667b53/romirenobomovamibuxo.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/15322702801.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c97be87549d---50383192849.pdfIn PDF document text
    • http://s-moonlight.com/CKEdit/upload/files/misemunizamurava.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f039c11a5---34182487746.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0cee52f70---88103113425.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/61941547278.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/d17ffa0b5ba6fc5618b9c8be93226756/bufedimusew.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/c4133fa1a0de1f28da1fac174d5fe759/35061323424.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9ebc1a1aa---2772131429.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/jakukojetagijufowebi.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812223252e2---temos.pdfIn PDF document text
    • http://orrizon.ru/images/file/ninitiludoretonipufinud.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e0c2e341d---70312305287.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=dijkstra+algorithm+network+routingPDF 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_off0000c9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F5 10964 bytes
SHA-256: 8e31997a2ec688f29034990675d5821b3335d6d687b9d8e48981d7273c720e62
font_01_sfnt_off0000e33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4E 17240 bytes
SHA-256: 137e581e8f43dada700e3e1616a5ed35430211df56d301e659f22dabcc195343