Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d12f5d35c300bc…

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 16:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 463deecc326a1fdcadf1a80f1d07c725 SHA-1: 0abaca64e5812ab8ad069074b5a4f4c7d1b8564f SHA-256: 55d12f5d35c300bc2e6412693b67a34207190ec4ea55f05980f176ab54c48e0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS platforms or disposable hosting. The primary purpose appears to be SEO manipulation or directing users to potentially malicious content, as suggested by the 'utm_term' parameter in one of the URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://coretry.ru/uplcv?utm_term=how+to+get+shiny+pokemon+go+cheat PDF link annotation
    • http://szerecsen.hu/editor_up/legudazi.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/bamusupogozela.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210918_6A4B6C5900F76698.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/a9dd2bklu40vf38qap6sjpn1lh/83748491294.pdfIn PDF document text
    • http://araulmor.tel-cor.com/images/library/file/xaxipefosiwudazepeniduna.pdfIn PDF document text
    • http://freestyler.cz/img/file/wewimudimemivemanawikib.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/92271838625.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/21692176059.pdfIn PDF document text
    • https://kultmotor.hu/images/files/85565853638.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/38454521943.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/10970385726.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/sifupesijenu.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/degubitasurasikafesanevoj.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/0e9370f97890f9eebf20ec23cf465d9e/80794375530.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/0b86e2adb332a9ce39134cc4ebf21b79/dutevasafigisi.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/22909061106.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/013808136dbde9609bf81b4bfca51a66/88828002144.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415b2be3997---kixog.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/14479099031.pdfIn PDF document text
    • http://wwsm-us.com/files/file/79959203732.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/9801702756.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/65237633046.pdfIn PDF document text
    • 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_off0000d947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD947 17916 bytes
SHA-256: a242b28a118d41515ddb2844fae2779a8f8938cfe54374934604039d18e226b5
font_01_sfnt_off0001082e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12045 10960 bytes
SHA-256: 4531161f51c096b7a9bc731b845a82383bd5128df9f9d38656730a0048ac4698

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