Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f7bbb0a829d5ca…

MALICIOUS

PDF

79.6 KB Created: 2021-07-02 15:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 641cb687131370411c397cb5a60d3941 SHA-1: 0236814bcdc3fd5197e18f7b6e943c49280e190d SHA-256: 43f7bbb0a829d5ca27debc6dcad4e92ac673433fada24b47e8e08a9bd57f7e46
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The PDF structure itself is also noted for duplicate object bodies, which can sometimes be used for obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/nnhj279qnsikcivq1gdfhp2btn/87432181178.pdf In PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/r6obclvlgvq5cdk52ij8fpdls1/8370788412.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/udm0kt5kefe2apgp1th2b4cj74/26808314192.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/30649861308.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/39466464474.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/37d642d12129e7968df5a3e4741ee8e6/pujopujusuwe.pdfIn PDF document text
    • http://954move.com/clients/4890/File/bivuxep.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21193d3152---gezede.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/nutupojogiwezafike.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/78748579580.pdfIn PDF document text
    • https://vestol.bg/files/file/sosunabejogedanowadafo.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c57a9488aa6---78726561392.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/megamo.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867bf67961c---5907764023.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f1913c02c---nukomudiwuxivirejato.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f929063f14---bokoje.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cad5b6796bb---38493886730.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/44533592148.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/45328833453.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/dh59ons7je3f8s19abojc1d4la/92631991480.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/49530025989.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/850e7be2e5da2685f6eb4e106065f036/55929983496.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c90c24ea8ba---10548517144.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/duxonajopuleliz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=waise+bhi+meaning+in+englishPDF 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_off0000d4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FB 17384 bytes
SHA-256: ee910f00fd2565da4fe58cd30dbd98a8c9fe7f4dd40454318122824898576b14
font_01_sfnt_off00010210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10210 10368 bytes
SHA-256: c1d710ea8894bd6eee453c7ee5c8598cf0bd4bcabb91708b4b6ff056c745118b
font_02_sfnt_off00011946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11946 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.