Malicious PDF — malware analysis report

Static analysis result for SHA-256 55a3fb6b07347abc…

MALICIOUS

PDF

92.9 KB Created: 2021-09-10 00:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ab0d64ba648143b5b64c2a780c62ff32 SHA-1: 35469abf0279cf1964856495570371e1c390da96 SHA-256: 55a3fb6b07347abc28c74769c9dae4118f09a65b6c1a894a1e8898dee4c4955c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs that form a link farm, likely intended to redirect users to malicious sites. The presence of these links and the overall structure suggest an attempt to lure users into clicking through to a compromised or malicious domain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9764

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://smidgel.ru/uplcv?utm_term=%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C+%D0%BC%D1%83%D0%BB%D1%8C%D1%82%D0%B8%D0%BA+%D0%BD%D1%83+%D0%BF%D0%BE%D0%B3%D0%BE%D0%B4%D0%B8+%D0%BD%D0%B0+%D0%B0%D0%BD%D0%B4%D1%80%D0%BE%D0%B8%D0%B4+%D0%B1%D0%B5%D1%81%D0%BF%D0%BB%D0%B0%D1%82%D0%BD%D0%BE PDF link annotation
    • http://rosesrealtyhomes.com/userfiles/files/wajidoxivozemikaresadadas.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612efc914b68e---71051076538.pdfIn PDF document text
    • https://razredna-nastava.net/files/bulejoroxurezofixi.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/gufatev.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/mipexepod.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1e80e331d---53820471084.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/lunujelepixofewebixixe.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132843c1d5da---rusoponetofexodomenalul.pdfIn PDF document text
    • http://telektrans.hu/editor_up/86604542155.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/84422226688.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131557e706ac---46534280557.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/35271080363.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/jokadibupegifixifit.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/zepixeresavojudol.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/46023233745.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/44618073715.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/romomuvexoxozemeserixuf.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/25933599619.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/13243203456.pdfIn PDF document text
    • http://sccsfz.org/upload/2021-09/linosexonolowakuw.pdfIn PDF document text
    • https://polaria.cz/images/file/gimin.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/33183807709.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/91058244138.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8356f08a8---87569117309.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210910052003.pdfIn PDF document text
    • https://webmenuplus.com/images/file/65176660595.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F9 29184 bytes
SHA-256: 0e4a985eed91a2c5399614212accb522f4e3e2ac0cb535bfb6a192d5881ca56d
font_02_sfnt_off000131a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A1 11052 bytes
SHA-256: 93de90f008db986e924d17db292e8b31fd39d9f5585089890c83d1dc98449445
font_03_sfnt_off00014b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B1C 16588 bytes
SHA-256: 6cf9e8f38f5a4466106cf8365adc2fbfc406d4233b541a1c1dead1938d6d017f

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